Destroy the Tripod Nest

Kill 20 enemies with Detonator Mines in a deployed state

Defeat the AI

Win the fight at the School

Kill a Cyst by catching its Mine and throwing it back

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

Survive your first encounter with Stalkers

Stomp 10 Containers

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

Get your first Suit

Discovered Lambda

Collect all Trophies.

Kill 30 enemies with the Line Gun.