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