12 10 heads are better than 1Kill 10 zombies in a row with headshots.
12 Complete a setDuring a single round kill an Infected, Suicider, Ram, Butcher, Floater, Walker.
12 HumanitarianKill 50 human enemies.
12 Karma-geddonKill 50 zombies using a vehicle.
12 Knock, knockBreach a locked door with the first blow.
12 Looking for troubleSurvive 5 waves in each of the 4 Arenas.
16 Can't touch thisUse a hammer to kill a series of 15 zombies without taking damage.
16 Gotta find'em allFind 60 collectibles.
16 Light my fireSet 10 zombies on fire simultaneously.
16 One is all I needKill 5 Infected in a row with a single blow.
20 A taste of everythingKill a zombie with 10 different melee weapons.
20 Dedicated studentReach level 25.
20 Extreme FirefightingSet 5 enemies on fire and then kill them with explosives.
20 FancySurvive 10 consecutive waves using only custom weapons.
20 Gladiator schoolSurvive 15 consecutive waves with each of the 4 characters.
20 Going steadyComplete 25 quests while playing with at least one co-op partner.
20 Guns don't kill but they helpKill 250 zombies using firearms.
20 Hack & slashKill 250 zombies using edged melee weapons.
20 Menage a troisComplete 5 quests with 3 co-op partners.
20 Nearly thereFind 120 collectibles.
20 Out of honey? Chew bees!Survive 5 waves using only your fists and legs.
20 RagemanKill 100 enemies with Fury attacks.
20 Swing them sticksKill 150 enemies using Analog Fighting controls.
20 Tae Kwon LeapKill 25 zombies with your bare fists.
20 To put it bluntlyKill 250 zombies using blunt melee weapons.
24 I want one of thoseCustomize 25 weapons.
24 Morituri te salutantSurvive 30 consecutive waves with at least one co-op player.
24 Right 4 LifeComplete act 1 with 4 different characters.
24 Rootin' Tootin' Lootin'Loot 5 Exceptional Weapons.
24 School of hard knocksReach level 50.
24 Steam PunkCreate weapons to rival the gods of fire or thunder.
24 Stick it to the enemySurvive 15 consecutive waves using the analog combat controls.
24 There and back againExplore the entire island.
40 Death IncarnateSurvive wave 30.
48 Busy, busy, busyFinish 75 quests cumulatively.
8 CardioTravel a distance of 20 kilometers on foot.
8 Catch!Kill an Infected with a grenade blast.
8 Gesundheit!Heal yourself with a medkit 100 times.
8 Learning the ropesReach level 10.
8 Need a hand?Join another player's game.
8 OriginalityPlay in a co-op team of 4 different playable characters.
8 People PersonPlay with 10 different co-op partners for at least 15 minutes each.
8 Road TripDrive a total distance of 10 kilometers.
8 Tis but a flesh wound!Sever 100 limbs.
8 Together in the lightComplete 5 quests in a single co-op game with the same partners.
8 Warranty Void if UsedCreate a customized weapon.
8 Wave and SmilePlay any Arena in co-op.