10 heads are better than 1 - 15 gamerpoints - Kill 10 zombies in a row with headshots.
A taste of everything - 25 gamerpoints - Kill a zombie with 10 different melee weapons.
A very special day - 30 gamerpoints - Kill 250 zombies with modified weapons.
Busy, busy, busy - 60 gamerpoints - Finish 75 quests cumulatively.
Can't touch this - 20 gamerpoints - Use a hammer to kill a series of 15 zombies without taking damage.
Cardio - 10 gamerpoints - Travel a distance of 20 kilometers on foot.
Catch! - 10 gamerpoints - Kill an Infected with a grenade blast.
Dedicated student - 25 gamerpoints - Reach level 25.
Gesundheit! - 10 gamerpoints - Heal yourself with a medkit 100 times.
Going steady - 25 gamerpoints - Finish 25 quests while playing with at least one co-op partner.
Gotta find'em all - 20 gamerpoints - Find 60 collectibles.
Guns don't kill but they help - 25 gamerpoints - Kill 250 zombies using firearms.
Hack & slash - 25 gamerpoints - Kill 250 zombies using edged melee weapons.
Humanitarian - 15 gamerpoints - Kill 50 human enemies.
I want one of those - 30 gamerpoints - Customize 25 weapons.
Karma-geddon - 15 gamerpoints - Kill 50 zombies using a vehicle.
Knock, knock - 15 gamerpoints - Breach a locked door with the first blow.
Learning the ropes - 10 gamerpoints - Reach level 10.
Light my fire - 20 gamerpoints - Set 10 zombies on fire simultaneously.
Ménage à trois - 25 gamerpoints - Finish 5 quests with 3 co-op partners.
Nearly there - 25 gamerpoints - Find 120 collectibles.
Need a hand? - 10 gamerpoints - Join another player's game.
One is all I need - 20 gamerpoints - Kill 5 Infected in a row with a single blow.
Originality - 10 gamerpoints - Play in a co-op team of 4 different playable characters.
People Person - 10 gamerpoints - Play with 10 different co-op partners for at least 15 minutes each.
Rageman - 25 gamerpoints - Kill 100 enemies with Fury attacks.
Right 4 Life - 30 gamerpoints - Finish act I with 4 different characters.
Road Trip - 10 gamerpoints - Drive a total distance of 10 kilometers.
Rootin' Tootin' Lootin' - 30 gamerpoints - Loot 5 Exceptional Weapons.
School of hard knocks - 30 gamerpoints - Reach level 50.
Steam Punk - 30 gamerpoints - Create weapons to rival the gods of fire or thunder.
Swing them sticks - 25 gamerpoints - Kill 150 enemies using Analog Fighting controls.
Tae Kwon Leap - 25 gamerpoints - Kill 25 zombies with your bare fists.
There and back again - 30 gamerpoints - Explore the entire island.
Tis but a flesh wound! - 10 gamerpoints - Sever 100 limbs.
To put it bluntly - 25 gamerpoints - Kill 250 zombies using blunt melee weapons.
Together in the light - 10 gamerpoints - Finish 5 quests in a single co-op game with the same partners.
Warranty Void if Used - 10 gamerpoints - Create a customized weapon.