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