Release Jennings from his Trap.

First kill with a Nail Bat.

Unlock 5 locked doors.

Used Health Syringe for the first time.

Unlocked first door.

First kill with a Pipe.

Fought first NPC.

First encounter with Pighead.

Complete Reverse Bear Trap.

Use a riot shield to beat down an enemy in Single Player or Special Ops.

Kill 2 enemies with a single bullet in Single Player or Special Ops.

Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.