Defeat 20 enemies with gunfire by aiming while hanging

Defeat 50 enemies with stealth attacks

Defeat five enemies in a row with headshots

Defeat three enemies with one explosion

Defeat 50 enemies with hand-to-hand combat

Collect the Crossblade

Free Samael from his prison

Meet Vulgrim

Find one treasure

Get 30 headshots while scoped in with the Fareye or Marksman in the single player Campaign.

Kill 1000 enemies in the single player Campaign.

Defeat the swarm in the single player Campaign.

Get 10 one-hit head-shot kills with the shotgun in the single player Campaign.