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