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