Complete act I with 4 different characters.
Play in a co-op team of 4 different playable characters.
Survive 5 waves in each of the 4 Arenas.
Set 5 enemies on fire and then kill them with explosives.
Set 10 zombies on fire simultaneously.
Play any Arena in co-op.
Kill 250 zombies using firearms.
Reach level 50.
Loot 5 Exceptional Weapons.
Find 120 collectibles.
Use a hammer to kill a series of 15 zombies without taking damage.
Breach a locked door with the first blow.
Heal yourself with a medkit 100 times.
Customize 25 weapons.
Kill 5 Infected in a row with a single blow.
Kill 150 enemies using Analog Fighting controls.
Find 60 collectibles.
Play with 10 different co-op partners for at least 15 minutes each.
Complete 5 quests with 3 co-op partners.
Complete 25 quests while playing with at least one co-op partner.
Finish 75 quests cumulatively.
Kill 250 zombies with modified weapons.
Kill 250 zombies using edged melee weapons.
Kill 25 zombies with your bare fists.
Reach level 25.
Kill 50 human enemies.
Sever 100 limbs.
Complete 5 quests in a single co-op game with the same partners.
Create weapons to rival the gods of fire or thunder.
Kill 250 zombies using blunt melee weapons.
Travel a distance of 20 kilometers on foot.
Kill a zombie with 10 different melee weapons.
Create a customized weapon.
Drive a total distance of 10 kilometers.
Reach level 10.
Kill 50 zombies using a vehicle.
Join another player's game.
Kill an Infected with a grenade blast.
Explore the entire island.
Kill 100 enemies with Fury attacks.
Kill 10 zombies in a row with headshots.
Survive 5 waves using only your fists and legs.
Kill enemies of 6 different types during a single round.
Survive 15 consecutive waves using the analog combat controls.
Survive 15 consecutive waves with each of the 4 characters.
Survive 10 consecutive waves using only custom weapons.
Survive 30 consecutive waves with at least one co-op player.
Survive wave 30.
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