Here is the full list of all 88 BrainBread 2 achievements.
Complete 'Fever: Objective' with 4 or more people
Complete 'Surgery' with 4 or more people
Complete 'Swamp Trouble' Objective with 4 or more people
Activate Zombie Rage
Kill 25 Humans when playing as a zombie
Activate the Blood Rage special
Activate the Gunslinger special
Become infected
Slice off, or explode at least 250 zombie heads
Kill 1,000 bandits
Kill 500 bandits
Deal a total amount of 1.000.000 damage to your foes!
Kick 25, punch 20 and uppercut 15 zombies to death in a single life
Kill three zombie players with headshots in a single life
Complete 'Nightclub' with 4 or more people
Use at least 10 healthkits in a single life
Get 69 headshots in a single life
Complete 25 quests
Complete 5 quests
Complete 'Carnage' with 4 or more people
Complete 'Compound' with 4 or more people
Get 300 kills with the HK MP510
Get 200 kills with the Desert Eagle
At least he ain't a zombie
Complete 'Island: Arena' with 4 or more people
Get 300 kills with the Uzi
Reach Level 500
Get 300 kills with the G36c
Get total of 240 kills with the Winchester
Complete 'Salvage' with 4 or more people
Reach Level 350
Reach Level 150
Get 12,000 kills with the Minigun
Kill 20,000 zombies
Reach Level 100
Get 100 kills with the fists
Get 280 kills with the Sledgehammer
Get 280 kills with the Machete
Complete 'Termoil' with 4 or more people
Get 500 kills with any dual weapon
Survive an entire game in Arena without using any firearms
Get 150 kills with the Remington 700
Get 80 kills with a Baseball Bat
Activate the Reality Phase special
Get 300 kills with the HK MP7
Get 200 kills with the Double Barrel
Get 300 kills with the MAC11
Complete the 'The Rooftops' with 4 or more people
You can't stop this hump train
Get the briefcase
Survive an entire game in Objective without using any firearms
Reach level 50
Get 35 kills with the combat knife
Get 120 kills with the Hatchet
Get 200 kills with the Glock17
Get 50 kills with the axe
Kill a human
Get 200 kills with any explosive material
Get 240 kills with the Famas
Don't throw the grenade just yet!
Kill 1,000 zombies
Get 150 kills with the Beretta
Complete 'Barracks: Arena' with 4 or more people
and you get nothing instead..
Get 300 kills with the AK-74
Get 210 kills with the Remington 870
Complete 'Laststand' with 4 or more people
Complete 'Swamp Trouble' with 4 or more people
Complete 'Devils Crypt' with 4 or more people
Kill someone with a propane tank
Kill Fred
Complete The tutorial
Complete 'Colosseum' with 4 or more people
Kill 100 zombies
Complete 'Cargo' with 4 or more people
Kill 25 zombies
Reach level 5
Win a match in the Arena
Your first zombie kill