Choose a costume for your sackperson with at least one item on your head, at least one item on your body, and a material

Complete "Exodus in America".

Kill 400 enemies with assault rifles, submachine guns or shotguns

Tie up 15 enemy combatants instead of executing them

Kill 100 enemies with a sniper rifle

Make a positive coop morality choice

Make a negative coop morality choice

Kill 3 floating enemies.