Full list of all 58 Dead Space 2 achievements worth 1,250 gamerscore. It takes around 20-25 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 8 achievements worth 250 Gamerscore.
Complete the game on Hard Core setting
Simultaneously have four completely upgraded weapons
Decompress 20 Necromorphs without getting sucked out yourself
Complete the game on Zealot setting
Kill 30 Necromorphs with Kinesis objects
Find the Peng treasure
Knock off every Tripod during the Elevator Sequence
Upgrade 1 Weapon completely
Dismember 2,500 Necromorph Limbs (single player only)
Kill 30 Crawlers without detonating them
Impale an enemy into a Decompression Window to cause it to blow out
Kill 6 enemies at once with Line Gun's Alt-Fire (single player only)
Kill 25 crawling enemies with Stomp (single player only)
Complete the game on any difficulty setting
Escape the Facility
Destroy the Marker
Survive the Eye Poke Machine
Upgrade your RIG and Stasis completely
Kill a Brute without taking damage
Impale an enemy with the Javelin Gun and use its Alt-Fire to shock 3 others (single player only)
Kill a Necromorph with every Weapon in the game (single player only).
Complete the Drill Ride
Kill 50 enemies using the Flamethrower
Purchase the Advanced Suit
Kill 50 Necromorphs while they are in Stasis (single player only)
Sever all three tentacles of a Lurker with one Line Gun Primary Fire shot (single player only)
Snare the Shard with the Ishimura
Collect 100 logs
Kill 20 enemies with Detonator Mines in a deployed state
Knock down an enemy with Contact Beam Alt-Fire then kill it with Primary Fire before it stands up
Destroy the Tripod Nest
Collect 10 Semiconductors
Kill a Stalker with the Seeker Rifle while in Zoom Mode
Complete the Solar Array Puzzle
Defeat the AI
Kill a Cyst by catching its Mine and throwing it back
Win the fight at the School
Kill 4 enemies with the same Ripper blade
Collect 10 Schematics
Kill the Tormenter
Survive your first encounter with Stalkers
Use Quick Heal ten times (single player only)
Get through the first Zero-G area
Dismember the Lightspeed Boy Statue
Impale an enemy and make him fly through the air for 17 meters - it must stick to the surface
Stomp 10 Containers
Survive the Train Sequence
TK Impale a live Slasher to a surface using a Slasher's arm - it must stick to the surface
Get your first Suit
Dismember 25 Necromorph Limbs (single player only)
Severed: Complete on Zealot difficulty
Severed: Kill 16 or more enemies in the final last stand combat sequence
Severed: Take out the gunship within 30 seconds
Severed: Defend the quarry platform until the door unlocks
Severed: In the grinder room, cause an enemy to die in the grinders
Severed: Complete Chapter 2
Severed: Find the Peng treasure in Severed
Severed: Complete Chapter 1