In Sink Hole, kill the helicopter pilot while the gunners are still alive.

Completed Going Hunting in a perfect run

Paid for a worthless tour of the world's largest bullet

Reached Level 51

You have defeated all bosses and are a powerful force to be reckoned with

Completed the "Braaaaaaaaaaaaains!" mission

Killed Ned...sort of

Completed the "House of the Ned" mission

Kicked the car and killed the soldiers in Uprising

Collected 3 panties, 5 fish in a bag, and 15 pizzas

Completed all co-op missions

Saved the hostages without alerting any enemies in Drop 'em Like Liquid

Reached the garage without going into man-down state in Hit and Run