Complete the following achievements to unlock Xbox Live Gamerscore points:
...And Stay Down (10) - Kill 25 crawling enemies with Stomp (single player only).
Think Fast (15) - Kill 30 Necromorphs with Kinesis objects.
Romper Stomper (25) - Stomp 10 Containers.
Vacuum Cleaner (30) - Decompress 20 Necromorphs without getting sucked out yourself.
Made Us Whole (10) - Complete the game on any difficulty setting.
Frozen in Time (10) - Kill 50 Necromorphs while they are in Stasis (single player only).
First Aid (10) - Use Quick Heal ten times (single player only).
Epic Dismemberment (50) - Dismember 2,500 Necromorph Limbs (single player only).
The Nanny (10) - Kill 30 Crawlers without detonating them.
C-Section (10) - Knock down an enemy with Contact Beam Alt-Fire then kill it with Primary Fire before it stands up.
Going for Distance (20) - Impale an enemy and make him fly through the air for 17 meters - it must stick to the surface.
Taste of your own Medicine (20) - TK Impale a live Slasher to a surface using a Slasher's arm - it must stick to the surface.
It's a Trap! (20) - Kill 20 enemies with Detonator Mines in a deployed state.
Necro Flambé (10) - Kill 50 enemies using the Flamethrower.
Peek a Boo! (20) - Kill a Stalker with the Seeker Rifle while in Zoom Mode.
Mission Impossible (50) - Complete the game on Zealot setting.
Brute Juke (10) - Kill a Brute without taking damage.
The Sampler Platter (20) - Kill a Necromorph with every Weapon in the game (single player only).
Lightspeed de Milo (10) - Dismember the Lightspeed Boy Statue.
Looking good (10) - Purchase the Advanced Suit.
Fully Outfitted (30) - Upgrade your RIG and Stasis completely.
Picking favorites (30) - Upgrade 1 Weapon completely.
Shoot the Limbs! (10) - Dismember 25 Necromorph Limbs (single player only).
Bouncing Betty (10) - Kill a Cyst by catching its Mine and throwing it back.
Skewered in Space (15) - Impale an enemy into a Decompression Window to cause it to blow out.
Hard to the Core (50) - Complete the game on Hard Core setting.
Clean Cut (10) - Sever all three tentacles of a Lurker with one Line Gun Primary Fire shot (single player only).
Lawnmower Man (10) - Kill 4 enemies with the same Ripper blade.
Fully Loaded (50) - Simultaneously have four completely upgraded weapons.
The Engineer (10) - Collect 10 Schematics.
My Boom Stick (20) - Kill 6 enemies at once with Line Gun's Alt-Fire (single player only).
Shock Therapy (10) - Impale an enemy with the Javelin Gun and use its Alt-Fire to shock 3 others (single player only).
Collect Peng (20) - Find the Peng treasure.
The Librarian (10) - Collect 100 logs.
The Electrician (10) - Collect 10 Semiconductors.
Additionally, there are fifteen secret achievements:
The Fugitive (50) - Escape the Facility.
Cross your Heart, Hope to Die (30) - Survive the Eye Poke Machine.
The Final Sacrifice (50) - Destroy the Marker.
Clever Girls (10) - Survive your first encounter with Stalkers.
Torment Me No More (20) - Kill the Tormenter.
The Graduate (20) - Win the fight at the School.
Patient on the Loose (15) - Get your first Suit.
Derailed (20) - Survive the Train Sequence.
One Small Step (10) - Get through the first Zero-G area.
Hornet's Nest (30) - Destroy the Tripod Nest.
Operation! (15) - Snare the Shard with the Ishimura.
Knock Knock (25) - Complete the Drill Ride.
Elevator Action (15) - Knock off every Tripod during the Elevator Sequence.
Shut Down (10) - Defeat the AI.
Powered Up (15) - Complete the Solar Array Puzzle.
Additionally, there are eight Severed DLC achievements:
Grind House (20) - In the grinder room, cause an enemy to die in the grinders.
Ship Shape (20) - Take out the gunship within 30 seconds.
The Betrayal (50) - Complete Chapter 1.
King of the Hill (20) - Defend the quarry platform until the door unlocks.
Peng Me Again (20) - Find the Peng treasure in Severed.
Remember the Alamo (20) - Kill 16 or more enemies in the final last stand combat sequence.
The Sacrifice (50) - Complete Chapter 2.
The Veteran (50) - Complete on Zealot.
Unlock Hardcore Mode
Beat the game under any difficulty.
Unlock Prequel Bonuses
Successfully complete Dead Space: Ignition in single player Ignition mode to unlock the Hacker suit (has bonus perks and hacking capabilities), a Hacker-themed Contact Beam weapon skin, exclusive audio logs, and extra power nodes, health packs, and credits.
Elite Space Suits
Successfully complete the game to unlock the Riot Armor Suit at the store and the Elite Engineer Suit schematic near the first store. Start a new game session to get the Vintage Elite Suit in Chapter 6, the Security Elite Suit in Chapter 9, and the Advance Elite Suit in Chapter 11.
New Game+ Mode
Successfully complete Campaign mode and save the game. This mode allows access to your all the weapons and items in the store and your inventory.
Extraction: Expert and Impossible Difficulty
Successfully complete Chapter 10.
Unlock Level Bonuses
Reach the indicated online level to unlock the corresponding bonus:
Level 04: Solid Army Green Suit
Level 07: Line Gun
Level 08: Solid Red Suit
Level 11: Force Gun
Level 13: Solid Black Suit
Level 14: Increased Magazine Size (Plasma Cutter)
Level 16: Solid Olive Suit
Level 17: Seeker Rifle
Level 20: Urban Camo Blue Suit
Level 23: Urban Camo Army Green Suit
Level 25: Increased Magazine Size (Line Gun)
Level 26: Urban Camo Red Suit
Level 28: Javelin Gun
Level 29: Increased Magazine Size (Force Gun)
Level 32: Urban Camo Military
Level 33: Increased Magazine Size (Seeker Rifle)
Level 34: Increased Weapon Damage (Plasma Cutter)
Level 36: Urban Camo Olive Suit
Level 41: Tiger Camo Blue Suit
Level 42: Increased Weapon Damage (Line Gun)
Level 44: Increased Magazine Size (Javelin Gun)
Level 45: Tiger Camo Army Green Suit
Level 46: Increased Weapon Damage (Force Gun)
Level 49: Tiger Camo Red Suit
Level 50: Increased Damage (Seeker Rifle)
Level 52: Tiger Camo Military Suit
Level 56: War Torn Suit
Level 57: Increased Weapon Damage (Javelin Gun)
Level 59: Visceral Games Suit
Chapter 7: Respec
Isaac can re-spec his weapons, RIG, and stasis module at the start of the chapter. Note: Each item re-spec costs 5,000 CR.
Easy Stalker Kills
If you are finding the Stalkers troublesome, the best weapon to use against them is the Line Gun. Try to find an area to back yourself into then simply wait and aim. They will eventually pop out and run at you. The Line Gun will easily dispose of them.
Unlock Special Suits and Weapons
After finishing the game, you get two suits that gaves you 25% more resistance to any hit and if you have an old Dead Space save file you get the original Plasma Cutter wich cost 0 credist and can be found on any store at any time.
Arctic Security Suit - Beat the game on Zealot difficulty to unlock at Store.
Dead Space 1 Plasma Cutter - Have an Dead space 1 Save File.
Elite Riot Suit - Available at store during New Game +.
Elite Security Suit - Schematic found in New Game + in Chapter 9 after you exit the tram, search over the railing.
Elite Vintage Suit - Schematic found in New Game + in Chapter 6 in the area you fight the tank before the end of the chapter.
Elite Advanced Suit - Schematic found in New Game + in Chapter 11 when the yellow lift reaches the top turn around and it is on the ledge between elevator and wall.
Elite Engineer Suit - Schematic found in New Game + during Chapter 2, just before the first short outer space section.
Hacker Suit - Have "Dead Space - Ignition" save file to unlock at Store.
Soldier Suit - Beat the game on Hardcore Mode to unlock at Store.
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.
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 the process as many times as desired.
Hidden Necromorph Messages
By moving around the menu areas you can find the following hidden messages. Use the Right Analog-stick to look around the menu areas:
Easy "Elevator Action" Achievement/Trophy
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"
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"
Right: "The answer is in chicxulub"
Left: "Welcome back Nicole Brennan"
Controller Map menu
Bottom right: "Let us fear nothing. Death is only a transition to the unity beyond"
In Chapter 7, immediately after Isaac starts the elevator to go to the Solar Array area, a group of Tripods will appear. Use the Detonator to shoot them. Hitting a Tripod with the Detonator anywhere on the body will usually knock it off. Use Stasis to hold a Tripod in place when more than one of them appears. Knock off all Tripods in this sequence to unlock the Achievement/Trophy.
Chapter V: Skip the Drag Tentacle
If one pauses the game and restarts from checkpoint during the drag tripod encounter in the Church of Unitology, the entire sequence is skipped and the Pack encounter automatically begins.