Collect 10 Semiconductors

Defeat the AI

Kill a Brute without taking damage

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

Survive your first encounter with Stalkers

Researched a Splicer with the Research Camera.

Bought one Plasmid or Tonic Slot at a Gatherer's Garden.

Get through the first Zero-G area

Use Quick Heal ten times (single player only)

Dismember 25 Necromorph Limbs (single player only)

Adopted a new Little Sister for the first time.

Defended yourself against Lamb's assault in the train station.