Kill 5 Infected in a row with a single blow.

Kill 50 human enemies.

Create weapons to rival the gods of fire or thunder.

Find 60 collectibles.

Complete 25 quests while playing with at least one co-op partner.

Kill 250 zombies with modified weapons.

Complete act I.

Drive a total distance of 10 kilometers.

Complete 5 quests in a single co-op game with the same partners.

Join another player's game.

Kill 250 zombies using blunt melee weapons.

Create a customized weapon.

Kill a zombie with 10 different melee weapons.