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