You've survived to Level 11. Survive to the Level 12... if you can.

You've survived to Level 7. Survive to the Level 8... if you can.

You've bought the fifth SP upgrade

You've bought your first SP upgrade

You've bought your first weapon upgrade

Use all abilities of each Monster at least once

Kill 200 feral zombies

Kill 100 shambling zombies

Slaughter 500 humans

In multiplayer, launch a Dead Rush of at least 40 zombies with Brainhov

Transform zombies into each of the 6 archetypes in one multiplayer game

Win a multiplayer game with Brainhov

Win a multiplayer game with Tycoon