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