Kill 50 zombies using a vehicle.
Create a customized weapon.
Breach a locked door with the first blow.
Complete 5 quests in a single co-op game with the same partners.
Complete 5 quests with 3 co-op partners.
Play in a co-op team of 4 different playable characters.
Kill 5 Infected in a row with a single blow.
Use a hammer to kill a series of 15 zombies without taking damage.
Kill 50 human enemies.
Set 10 zombies on fire simultaneously.
Kill 10 zombies in a row with headshots.
Kill a zombie with 10 different melee weapons.
Kill 250 zombies using blunt melee weapons.
Kill 250 zombies using edged melee weapons.
Kill 250 zombies using firearms.
Kill 25 zombies with your bare fists.
Customize 25 weapons.
Kill an Infected with a grenade blast.
Drive a total distance of 10 kilometers.
Travel a distance of 20 kilometers on foot.
Loot 5 Exceptional Weapons.
Sever 100 limbs.
Explore the entire island.
Heal yourself with a medkit 100 times.
Kill 150 enemies using Analog Fighting controls.
Complete act 1 with 4 different characters.
Finish 75 quests cumulatively.
Reach level 10.
Reach level 25.
Reach level 50.
Find 60 collectibles.
Find 120 collectibles.
Create weapons to rival the gods of fire or thunder.
Join another player's game.
Kill 100 enemies with Fury attacks.
Play with 10 different co-op partners for at least 15 minutes each.
Complete 25 quests while playing with at least one co-op partner.
Play any Arena in co-op.
Set 5 enemies on fire and then kill them with explosives.
During a single round kill an Infected, Suicider, Ram, Butcher, Floater, Walker.
Survive 5 waves in each of the 4 Arenas.
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 5 waves using only your fists and legs.
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