Kill 20 enemies with explosive damage.

Get 20 Headshots.

Complete Arrowtree on Hardcore.

Chain together any 3 physical abilities in 5 seconds or less.

Defeat Akasha and complete the campaign in Insane.

Defeat Akasha and complete the campaign.

Complete Chapter 4.

Get "Bullseye" (self-destruct to destroy an enemy) award in 20 matches.

Get the "Roadkill" award in 10 matches.

Make all possible combinations in the inventory.

Complete the game.

Don't Kill Sarah.