Decompress 20 Necromorphs without getting sucked out yourself

Complete the game on any difficulty setting

Destroy the Marker

Simultaneously have four completely upgraded weapons

Upgrade 1 Weapon completely

Survive the Eye Poke Machine

Upgrade your RIG and Stasis completely

Kill 30 Crawlers without detonating them

Complete the Drill Ride

Purchase the Advanced Suit

Snare the Shard with the Ishimura

Collect 100 logs

Kill 30 Necromorphs with Kinesis objects

Kill 50 enemies using the Flamethrower

Destroy the Tripod Nest

Kill a Necromorph with every Weapon in the game (single player only).

Knock down an enemy with Contact Beam Alt-Fire then kill it with Primary Fire before it stands up

Kill 25 crawling enemies with Stomp (single player only)

Complete the Solar Array Puzzle

Kill 20 enemies with Detonator Mines in a deployed state

Defeat the AI

Kill a Brute without taking damage

Win the fight at the School

Kill 50 Necromorphs while they are in Stasis (single player only)

Kill a Stalker with the Seeker Rifle while in Zoom Mode

Sever all three tentacles of a Lurker with one Line Gun Primary Fire shot (single player only)

Kill a Cyst by catching its Mine and throwing it back

Kill the Tormenter

Kill 4 enemies with the same Ripper blade

Survive your first encounter with Stalkers

Get through the first Zero-G area

Impale an enemy into a Decompression Window to cause it to blow out

Impale an enemy and make him fly through the air for 17 meters - it must stick to the surface

Dismember the Lightspeed Boy Statue

Kill 6 enemies at once with Line Gun's Alt-Fire (single player only)

Impale an enemy with the Javelin Gun and use its Alt-Fire to shock 3 others (single player only)

Survive the Train Sequence

Use Quick Heal ten times (single player only)

Stomp 10 Containers

Get your first Suit

Dismember 25 Necromorph Limbs (single player only)

TK Impale a live Slasher to a surface using a Slasher's arm - it must stick to the surface