Survive 5 waves using only your fists and legs.

Set 5 enemies on fire and then kill them with explosives.

Kill 250 zombies with modified weapons.

Survive 10 consecutive waves using only custom weapons.

Create weapons to rival the gods of fire or thunder.

Drive a total distance of 10 kilometers.

Kill 150 enemies using Analog Fighting controls.

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

Reach level 10.

Complete 5 quests with 3 co-op partners.

Create a customized weapon.

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