Remain undetected in a whole checkpoint

Achieve your first accident kill

Escape attention from enemies

Recover the shuttle.

Use quick heal to heal yourself 20 times.

Add a Circuit to a Weapon.

Complete the Prologue.

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

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

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

Dismember 2,500 Necromorph Limbs (single player only)

Find the Peng treasure

Kill 50 enemies using the Flamethrower