RNumbers

Patient on the Loose Get your first Suit

Derailed Survive the Train Sequence

First Aid Use Quick Heal ten times (single player only)

Romper Stomper Stomp 10 Containers

One Small Step Get through the first Zero-G area

Clever Girls Survive your first encounter with Stalkers

Torment Me No More Kill the Tormenter

The Graduate Win the fight at the School

Shut Down Defeat the AI

Powered Up Complete the Solar Array Puzzle

The Engineer Collect 10 Schematics

The Electrician Collect 10 Semiconductors

Hornet's Nest Destroy the Tripod Nest

Operation! Snare the Shard with the Ishimura

The Librarian Collect 100 logs

Knock Knock Complete the Drill Ride

Cross your Heart, Hope to Die Survive the Eye Poke Machine

Looking good Purchase the Advanced Suit

Made Us Whole Complete the game on any difficulty setting

The Fugitive Escape the Facility

The Final Sacrifice Destroy the Marker

Brute Juke Kill a Brute without taking damage

Taste of your own Medicine TK Impale a live Slasher to a surface using a Slasher's arm - it must stick to the surface

Picking favorites Upgrade 1 Weapon completely

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

Fully Outfitted Upgrade your RIG and Stasis completely

Lightspeed de Milo Dismember the Lightspeed Boy Statue

...And Stay Down Kill 25 crawling enemies with Stomp (single player only)

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

Bouncing Betty Kill a Cyst by catching its Mine and throwing it back

Collect Peng Find the Peng treasure

Trial by Judgement Defeat Nemesis

Failed Escape Finish Act 1

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

Silence the Song Defeat Hyperion

Lawnmower Man Kill 4 enemies with the same Ripper blade

Peek a Boo! Kill a Stalker with the Seeker Rifle while in Zoom Mode

Inner Darkness Defeat Ophion

Last Drive Finish Act 2

Necro Flambé Kill 50 enemies using the Flamethrower

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

It's a Trap! Kill 20 enemies with Detonator Mines in a deployed state

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

Think Fast Kill 30 Necromorphs with Kinesis objects

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

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

Adapting to Circumstance Achieve Weapon Proficiency level 30

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

Sins of the Mother Complete all House sequences
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Fully Loaded Simultaneously have four completely upgraded weapons