Reunite with your Space Marine brothers.

Survive the Eye Poke Machine

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

Complete the Drill Ride

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

Complete any level with at least 80% Stasis Accuracy

Destroy the Tripod Nest

Complete the Solar Array Puzzle

Collect 10 Schematics

Kill the Tormenter

Get through the first Zero-G area

Survive the Train Sequence

Use Quick Heal ten times (single player only)