Dead Space 2

Level bonuses:
Unlock the following bonuses by reaching the corresponding level online:

BONUS - LEVEL
Solid Army Green Suit - Level 04
Line Gun - Level 07
Solid Red Suit - Level 08
Force Gun - Level 11
Solid Black Suit - Level 13
Increased Magazine Size (Plasma Cutter) - Level 14
Solid Olive Suit - Level 16
Seeker Rifle - Level 17
Urban Camo Blue Suit - Level 20
Urban Camo Army Green Suit - Level 23
Increased Magazine Size (Line Gun) - Level 25
Urban Camo Red Suit - Level 26
Javelin Gun - Level 28
Increased Magazine Size (Force Gun) - Level 29
Urban Camo Military - Level 32
Increased Magazine Size (Seeker Rifle) - Level 33
Increased Weapon Damage (Plasma Cutter) - Level 34
Urban Camo Olive Suit - Level 36
Tiger Camo Blue Suit - Level 41
Increased Weapon Damage (Line Gun) - Level 42
Increased Magazine Size (Javelin Gun) - Level 44
Tiger Camo Army Green Suit - Level 45
Increased Weapon Damage (Force Gun) - Level 46
Tiger Camo Red Suit - Level 49
Increased Damage (Seeker Rifle) - Level 50
Tiger Camo Military Suit - Level 52
War Torn Suit - Level 56
Increased Weapon Damage (Javelin Gun) - Level 57
Visceral Games Suit - Level 59

Additionally,
you can unlock the Solid Viral White Suit or Urban Camo Viral Yellow
Suit by killing a player that is wearing them.

Necromorph upgrades:
Unlock the following Necromorph upgrades by reaching the corresponding levels in your online career:

UPGRADE - LEVEL
Lurker Execution Attack Damage Increase - Level 27
Lurker Health Increase - Level 43
Lurker Melee Damage Increase - Level 15
Lurker Range Damage Increase - Level 3
Pack Execution Attack Damage Increase - Level 18
Pack Gets Out of Stasis Faster - Level 48
Pack Health Increase - Level 31
Pack Melee Damage Increase - Level 6
Puker Execution Attack Damage Increase - Level 24
Puker Health Increase - Level 58
Puker Melee Damage Increase - Level 39
Puker Ranged Damage Increase - Level 12
Spitter Execution Damage Increase - Level 9
Spitter Health Increase - Level 53
Spitter Melee Damage Increase - Level 21
Spitter Ranged Damage Increase - Level 35

Infinite Semi-conductors, Nodes, And Money:
In
Chapter 15, go to the final room where there is a store and save point.
Then, go back down the corridor and enter the room with the two power
nodes, a Ruby Semiconductor and some other items. Collect all of the
items and return to the save point. Save the game, the reload it. Go
back to the locked Node room and the items will be there again. Collect
them again and repeat this as desired. You can also do this in chapters 6
& 7.

Hand cannon:
Complete the game under the
Hardcore difficulty setting and upgrade the plasma pistol. Go to the
first shop to find the one hit kill hand cannon. This weapon resembles a
foam finger, and when fired Isaac makes "Bang Bang" and "Pew Pew Pew"
sounds.

Prequel bonuses:
Complete Dead Space: Ignition
in single-player Ignition mode to unlock the Hacker suit, a
Hacker-themed Contact Beam weapon skin, exclusive audio logs, and extra
power nodes, health packs, and credits.

Refurbished Plasma Cutter:
Have
a saved game file from the original Dead Space to unlock the ability to
purchase the Refurbished Plasma Cutter from the store at the start of
the game.

Unlockable suits:
Unlock the following suits by performing the corresponding tasks:

SUIT - HOW TO UNLOCK
Arctic Security Suit - Complete the game under the Zealot difficulty to unlock it at the store
Elite
Advanced Suit - Find the schematic in New Game + mode during Chapter
11. When the yellow lift reaches the top, turn around to find it on the
ledge between the elevator and wall.
Elite Engineer Suit - Find the schematic in New Game + mode during Chapter 2, just before the first short outer space section.
Elite Riot Suit - Purchase at the store in New Game + mode or log into the same EA account in the iPod/iPhone Dead Space game.
Elite Security Suit - Find the schematic in New Game + mode during Chapter 9. After you exit the tram, search over the railing.
Elite
Vintage Suit - Find the schematic in New Game + mode during Chapter 6.
Search the area where you fight the tank before the end of the chapter.
Hacker Suit - Have a saved game file from Dead Space - Ignition to unlock it at the store.
Soldier Suit - Complete the game under the Hardcore difficulty to unlock it at the store.

Hardcore difficulty:
Complete
Campaign mode to unlock the Hardcore difficulty setting. This mode only
allows you to restart from the last save game and only three save slots
for the entire campaign will be available. You also cannot start this
difficulty from the "New Game +" option.

New Game + mode:
Complete
Campaign mode and load the cleared saved game file. This mode allows
access to your all the weapons and items in the store and your
inventory.

Chapter 7: Peng's treasure:
Find the
mainframe room where ANTI is located. The circuit room that is to the
left has breakers that also turn blue in addition to green or red.
Insert the four breakers in that circuit room to change them to blue.
Follow the access tunnel to reach Peng's Treasure.

Chapter 7: Respec:
Isaac can re-spec his weapons, stasis module, and RIG at the start of the chapter. Note: Each item re-spec costs 5,000 CR.

Extraction: Change weapons:
Note:
This only affects the current level. Exit to the main menu, then return
to the level. You can use the the weapon loadout screen to change
weapons. You will resume with the default ammunition for that weapon.
Note: You can only select the left special weapon; the other two special
weapons are deleted from your inventory.

Extraction: Expert and Impossible difficulty:
Complete Chapter 10 "Secrets And Salvation" to unlock the Expert and Impossible difficulty settings.

How to kill Stalkers:
Use the Line Gun against Stalkers. Find an area to hide and then wait and aim. They will pop out and run at you.

Restoring health:
To restore your health, use the shop and the work bench. When you wear a suit for the first time your health will be restored.

To
restore your health, purchase the Respec ability for 5,000 credits.
Remove the Power Nodes from the Rig and replace them to receive full
health.

Use the shop and the work bench to restore your health. When you wear a suit for the first time your health is refilled.

Purchase the Respec ability for 5,000 credits. Remove the Power Nodes from the Rig and replace them for full health.

Unlimited credits:
To
get unlimited credits, purchase the Supernova or Martial Law
downloadable content. Go to the store and purchase the Detonator weapon
for free. Fire the mines at a wall, then deactivate them and collect
them. Do not reload the Detonator. Sell the mines and Detonator for
credits at the store. Buy the Detonator back for free and it will be
fully stocked. Repeat as desired.

Schematic locations:
Find the following schematics in the corresponding locations:

Chapter 2
Power
Node: Found in the first Power Node locked room you find. You can open
the locked door with a Power Node. One can be found on the ground
through the door to the left of the closet.
Hacker Suit: Found at the end of the tram walkway area, near the location you encounter the Fire Sack Necromorphs.
Stasis Pack: Found on the tracks by where the flaming train passes you for the first time.

Chapter 3
Pulse Rifle: Once you are out of the train, it is in a corner just behind where the train is hanging.
Javelin Spears: Found behind the big marker statue towards the windows on the left.

Chapter 4
Security Suit: Found on the top shelf of the room just past the door that you must slow down to walk through.

Chapter 5
Ripper: In the multi level room, ride the elevator down, then go to the right side of the room.
Medium
Health Pack: After turning off the gravity and going through the holes
in the ceiling, it will be floating in the middle of the room.
Line
Gun Ammo: After crawling through the duct and falling, you will go
through a storage room. You will find it behind some shelves on the
right side.
Detonator: Found in a room at the top of the church by the save station.

Chapter 6
Seeker
Rifle: On the path at the start of the chapter, enter the door to the
right. You will be on a balcony and the schematic will be on the far
right side on the ground.
Pulse Rounds: When you first meet Ellie,
she will unlock the gate. Instead of going through the gate behind her,
follow the path around to the right where it is blocked by debris
Flame
Thrower: After you exit the gym, follow the path and go into the
classroom to find the "Kids Gone Crazy" text log. In that same room,
there is a smaller room on the right side with blood on the wall. The
schematic is on the ground.

Chapter 7
Ripper
Blades: At the start of the chapter when you enter zero gravity, the
schematic will be floating at the bottom of the room.
Force Gun:
After you exit the elevator, turn left. You will find some yellow
lockers. The schematic in the second locker from the left.
Contact
Beam: The schematic is in the locked closet to the left of the location
where you first see the save station on the wall. Use a Power Node to
open the closet and get it.

Chapter 8
Vintage Suit: Found in the first locked door in this chapter.
Detonator Mines: When you first talk to Ellie and Stross, go to the next room, and take a left. The schematic is beside a body.
Large
Med Pack: Found in the room where you first meet Ellie. It is located
past the table in the corner. Use kinesis to move the table.

Chapter 9
Flame
Fuel: When you encounter the laser traps, take a right from where they
were located. You will see a few crates lying around. Use kinesis to
move them to find the schematic and an audio log.
Seeker Shells: Found behind the guardian mounted near the exit door of the room where you fight Stalkers and Cysts.

Chapter 10
Force Energy: When you reach the zero gravity area, go to the lower level to find it on the ground.

Chapter 11
Contact
Energy: In the zero gravity station where you move the lasers to gain
access to the shaft that leads inside, look outside from the inside of
the shaft to find it.
Advanced Suit: Enter the locked room opposite
of the detonator mines trap. The schematic is inside this room, but you
need a Power Node to open this locked room.

Hidden Necromorph messages:
Move around the menu areas to find the following hidden messages. Use the Right Analog-stick to look around the menu areas.

Main menu
Upper left: "In the end, It all comes down to just one little thing..."
Bottom right: "Unity after death, Unity forever."

Single Player menu
Upper left: "Your body now, Our body later, One body forever"

Multiplayer menu
Upper middle: "It's not over between us, you can't run from me forever"
Bottom middle Make us Whole"

Quick Match menu
Bottom right: "We must believe in it and bend ourselves to its will and then it will heal us"

Leaderboard menu
Right: "The answer is in chicxulub"

Extra menu
Left: "Welcome back Nicole Brennan"

Controller Map menu
Bottom right: "Let us fear nothing. Death is only a transition to the unity beyond"

Chapter 3: Easy credits:
Walk
through the Cassini Towers and wait until Isaac has another "freakout"
in the little girl's room. When it ends walk to the dresser to the right
to find 1,500 credits under the stuffed teddy bear.

Peng statue (Severed):
Towards the end of the game, go through the showers to find the Peng statue and some medpacks on a stretcher.

Trophies:

Bronze trophies
Made Us Whole - Complete the game on any difficulty setting.
Romper Stomper - Stomp 10 Containers.
Vacuum Cleaner - Decompress 20 Necromorphs without getting sucked out yourself.
...And Stay Down - Kill 25 crawling enemies with Stomp (single player only).
Think Fast - Kill 30 Necromorphs with Kinesis objects.
The Nanny - Kill 30 Crawlers without detonating them.
Frozen in Time - Kill 50 Necromorphs while they are in Stasis (single player only).
First Aid - Use Quick Heal ten times (single player only).
Looking good - Purchase the Advanced Suit.
Fully Outfitted - Upgrade your RIG and Stasis completely.
Picking favorites - Upgrade 1 Weapon completely.
Fully Loaded - Simultaneously have four completely upgraded weapons.
The Sampler Platter - Kill a Necromorph with every Weapon in the game (single player only)..
Lightspeed de Milo - Dismember the Lightspeed Boy Statue.
The Librarian - Collect 100 logs.
My Boom Stick - Kill 6 enemies at once with Line Gun's Alt-Fire (single player only).
Shock Therapy - Impale an enemy with the Javelin Gun and use its Alt-Fire to shock 3 others (single player only).
Lawnmower Man - Kill 4 enemies with the same Ripper blade.
It's a Trap! - Kill 20 enemies with Detonator Mines in a deployed state.
Necro Flambé - Kill 50 enemies using the Flamethrower.
Peek a Boo! - Kill a Stalker with the Seeker Rifle while in Zoom Mode.
C-Section - Knock down an enemy with Contact Beam Alt-Fire then kill it with Primary Fire befire it stands up.
Going for Distance - Imaple an enemy and make him fly through the air for 17 meters - it must stick to the surface.
Taste of your own Medicine - TK Impale a live Slasher to a surface using a Slasher's arm - it must stick to the surface.
Skewered in Space - Impale an emey into a Decompression Window to cause it to blow out.
Clean Cut - Sever all three tentacles of a Lurker with one Line Gun Primary Fire shot (single player only).
Brute Juke - Kill a Brute without taking damage.
Shoot the Limbs! - Dismember 25 Necromorph Limbs (single player only).
Bouncing Betty - Kill a Cyst by catching its Mine and throwing it back.
Patient on the Loose - Get your first Suit.
Derailed - Survive the Train Sequence.
One Small Step - Get through the first Zero-G area.
Clever Girls - Survive your first encounter with Stalkers.
Torment Me No More - Kill the Tormentor.
The Graduate - Win the fight at the School.
Elevator Action - Knock off every Tripod during the Eleveator Sequence.
Shut Down - Defeat the AI.
Powered Up - Complete the Solar Array Puzzle.
Hornet's Nest - Destroy the Tripod Nest.
Operation! - Snare the Shard with the Ishimura.
Knock Knock - Complete the Drill Ride.
The Final Sacrifice - Destroy the Marker.
Cross your Heart, Hope to Die - Survive the Eye Poke Machine.

Silver trophies
Epic Dismemberment - Dismember 2,500 Necromorph Limbs (single player only).
Collect Peng - Find the Peng treasure.
The Electrician - Collect 10 Semiconductors.
The Engineer - Collect 10 Schematics.

Gold trophies
Mission Impossible - Complete the game on Zealot setting.
Hard to the Core - Complete the game on Hard Core setting.
The Fugitive - Escape the Facility.

Platinum trophy
The Final Frontier - Earn all Bronze, Silver, and Gold trophies.

"Severed" trophies:

Bronze trophies
Grind House - Severed: In the grinder room, cause an enemy to die in the grinders.
King of the Hill - Severed: Defend the quarry platform until the door unlocks.
Peng Me Again - Severed: Find the Peng treasure in Severed.
Remember the Alamo - Severed: Kill 16 or more enemies in the final last stand combat sequence.

Silver trophies
The Veteran - Severed: Complete on Zealot difficulty.
The Betrayal - Severed: Complete Chapter 1.
The Sacrifice - Severed: Complete Chapter 2.
Ship Shape - Severed: Take out the gunship within 30 seconds.