Here is the full list of all 57 Bunch of Heroes achievements.
Eliminate 35.000 zombies
Kill 5.000 Martians
Eliminate 100 Martian Teleporters
Eliminate 200 Martians with melee attacks
Pickup 1,000 weapons
Eliminate 200 Martian with shields
Eliminate 1,000 Generals
Reload your extra weapon 1,000 times
Eliminate 1,000 Zombie Evaders
Eliminate 200 Zombies with market cars
Burn 1,000 Zombie Chickens
Perform 100 Ultra Attacks
Protect 50 cheerleaders
Roll 20 times while on fire
While playing with 1 ally get to survival's wave 6 without anyone dying
Eliminate 1,000 Walking Coffins
Place 100 turrets
While in survival mode and playing alone: get to wave 3 without having been damaged
While in survival mode get to wave 12 playing alone
Eliminate 1,000 Zombies with bayonets
Eliminate 1,000 Radioactive Zombies
Perform a 80 kill combo while in survival mode
While in survival mode and playing alone: get to wave 3 in less than 5 minutes
Check out the Credits
Complete all Mars missions
Complete all missions
Kill the Martian King
Eliminate 100 Flying-Saucers
Kill 200 Strong Martian
Eliminate 500 zombie astronauts
Eliminate 723 zombie chickens, 821 basic zombies and 394 zombie astronauts
Eliminate 200 zombies with melee attacks
Defeat Fatzi
Complete all cemetery missions
Eliminate 1,000 Zombie Chickens
Defeat Pumpking
Complete a mission with each of the characters
Reach a combo of 60
Complete a mission with full health
Eliminate 1,000 Basic Zombies
While playing with 2 allies get to survival's wave 9 without anyone dying
Kill a Martian Teleporter in survival mode
Defeat Fred
Pickup every weapon in the game
Defeat Jazzy
Complete all farm missions
Complete 10 4-player missions
Complete 1 mission without picking up any Ultra Charges
Complete a multiplayer mission without damaging any allies
Complete a mission without picking up any weapons
Complete a mission without dying
While playing with 3 allies get to survival's wave 9 without anyone dying
Get to survival's wave 5 in less than 3 minutes
Survive up to the 20th wave in Santa's map in any difficulty
Reach a combo of 20
Reach a combo of 40
Get over a 1.000.000 points in survival