Complete act IV.

Sever 100 limbs.

Kill 50 human enemies.

Play with 10 different co-op partners for at least 15 minutes each.

Reach level 25.

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.

Drive a total distance of 10 kilometers.

Kill a zombie with 10 different melee weapons.

Kill 25 zombies with your bare fists.

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