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