In Mob of the Dead, open a door without spending points.

Single Player: Kill 10 enemies using hacked sentry guns

Complete Safeties Off

Acquire 5 Mutations.

Counter enemy attacks 20 times using Shield.

Karate kick a helicopter.

5 consumes in 10 seconds or less.

Acquire a Prototype Power.

Complete RESURRECTION.

Single Player: Kill 25 enemies using only the Nanosuit's enhanced powers instead of guns

Use your biggest weapon

Big head, big headache