Kill 10 or more zombies at the same time in any game mode

Build and save a level with the thermometer more than 30% full

Create a living creature with at least 2 eyes, 2 legs or wheels, and a brain

Campaign: drive 5 km in any land vehicle

Campaign: finish Crack the Sky

Campaign: finish Upriver

Campaign: finish Heart of Darkness

Campaign: destroy 1 satellite uplink

Campaign: 50 kills with assault rifles

Campaign: finish Operation Aurora

Complete the Tutorial mission.

Perform 3 kill moves in a row. (Single Player)

Smash an enemy's face into a wall. (Single Player)