Start the Single Player Campaign on any difficulty.

Complete the game on any difficulty setting

Destroy the Marker

Survive the Eye Poke Machine

Purchase the Advanced Suit

Collect 100 logs

Upgrade 1 Weapon completely

Kill a Brute without taking damage

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

Defeat the AI

Kill the Tormenter

Survive your first encounter with Stalkers

Get through the first Zero-G area