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

Kill 50 zombies using a vehicle.

Find 60 collectibles.

Complete act I.

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

Survive 30 consecutive waves with at least one co-op player.

Set 10 zombies on fire simultaneously.

Sever 100 limbs.

Join another player's game.

Travel a distance of 20 kilometers on foot.

Create a customized weapon.

Reach level 10.

Won one round of Tank Superiority