10 ...And Stay DownKill 25 crawling enemies with Stomp (single player only)
10 Bouncing BettyKill a Cyst by catching its Mine and throwing it back
10 Brute JukeKill a Brute without taking damage
10 C-SectionKnock down an enemy with Contact Beam Alt-Fire then kill it with Primary Fire before it stands up
10 Clean CutSever all three tentacles of a Lurker with one Line Gun Primary Fire shot (single player only)
10 First AidUse Quick Heal ten times (single player only)
10 Frozen in TimeKill 50 Necromorphs while they are in Stasis (single player only)
10 Lawnmower ManKill 4 enemies with the same Ripper blade
10 Lightspeed de MiloDismember the Lightspeed Boy Statue
10 Looking goodPurchase the Advanced Suit
10 Made Us WholeComplete the game on any difficulty setting
10 Necro FlambéKill 50 enemies using the Flamethrower
10 Shock TherapyImpale an enemy with the Javelin Gun and use its Alt-Fire to shock 3 others (single player only)
10 Shoot the Limbs!Dismember 25 Necromorph Limbs (single player only)
10 The ElectricianCollect 10 Semiconductors
10 The EngineerCollect 10 Schematics
10 The LibrarianCollect 100 logs
10 The NannyKill 30 Crawlers without detonating them
10 Clever GirlsSurvive your first encounter with Stalkers
10 One Small StepGet through the first Zero-G area
10 Shut DownDefeat the AI
15 Skewered in SpaceImpale an enemy into a Decompression Window to cause it to blow out
15 Think FastKill 30 Necromorphs with Kinesis objects
15 Elevator ActionKnock off every Tripod during the Elevator Sequence
15 Operation!Snare the Shard with the Ishimura
15 Patient on the LooseGet your first Suit
15 Powered UpComplete the Solar Array Puzzle
20 Collect PengFind the Peng treasure
20 Going for DistanceImpale an enemy and make him fly through the air for 17 meters - it must stick to the surface
20 It's a Trap! 20Kill 20 enemies with Detonator Mines in a deployed state
20 My Boom StickKill 6 enemies at once with Line Gun's Alt-Fire (single player only)
20 Peek a Boo!Kill a Stalker with the Seeker Rifle while in Zoom Mode
20 Taste of your own MedicineTK Impale a live Slasher to a surface using a Slasher's arm - it must stick to the surface
20 The Sampler PlatterKill a Necromorph with every Weapon in the game (single player only).
20 DerailedSurvive the Train Sequence
20 The GraduateWin the fight at the School
20 Torment Me No MoreKill the Tormenter
25 Romper StomperStomp 10 Containers
25 Knock KnockComplete the Drill Ride
30 Fully OutfittedUpgrade your RIG and Stasis completely
30 Picking favoritesUpgrade 1 Weapon completely
30 Vacuum CleanerDecompress 20 Necromorphs without getting sucked out yourself
30 Cross your Heart, Hope to DieSurvive the Eye Poke Machine
30 Hornet's NestDestroy the Tripod Nest
50 Epic DismembermentDismember 2,500 Necromorph Limbs (single player only)
50 Fully LoadedSimultaneously have four completely upgraded weapons
50 Hard to the CoreComplete the game on Hard Core setting
50 Mission ImpossibleComplete the game on Zealot setting
50 The Final SacrificeDestroy the Marker
50 The FugitiveEscape the Facility