Here is the full list of all 67 Kick Ass Commandos achievements.
Rank Up a Commando to Sergeant
Survive the Dreaded Showers in Mission Pack 1
Rank Up a Commando to Corporal
Unlock Commando Blondie in Mission Pack 1
Rank Up a Commando to Private 1st Class
Kill 100 Enemies
Unlock Commando Mohawk in Mission Pack 1
Complete the Tutorial Mission
Complete Mission Pack 1: Basic Training
Complete Mission Pack 2: Krystal Yayo
Complete Mission Pack 3: Bombs Away
Complete Mission Pack 4: Going Rogue
Complete Mission Pack 5: DNA Test
Complete Mission Pack 6: Hell on Ice
Unlock Commando 6-Pack in Mission Pack 1
Unlock Commando Blaze in Mission Pack 2
Unlock Commando Joker in Mission Pack 3
Unlock Commando Ricardo in Mission Pack 4
Unlock Commando Midnight in Mission Pack 4
Unlock Commando Gator Jack in Mission Pack 5
Unlock Commando Berserker in Mission Pack 6
Kill 500 Enemies
Kill 2,500 Enemies
Kill 10,000 Enemies
Kill 25,000 Enemies
Rescue 25 Commandos
Rescue 100 Commandos
Rescue 250 Commandos
Rescue 500 Commandos
Rescue 1,000 Commandos
5,000 Enemies Killed by Bullets
250 Enemies Killed by Explosions
250 Enemies Killed by Flames
500 Enemies Killed by Grenades
100 Enemies Killed by Knife Stabs
25 Enemies Killed by Landmines
500 Enemies Killed by Rockets
50,000 Bullets Fired by the Player
10,000 Flames Fired by the Player
1,000 Grenades Thrown by the Player
1,000 Knife Stabs by the Player
1,000 Rockets Fired by the Player
Rank Up a Commando to Staff Sergeant
Rank Up a Commando Sergeant 1st Class
Rank Up a Commando 2nd Lieutenant
Rank Up a Commando 1st Lieutenant
Rank Up a Commando Captain
Rank Up a Commando Major
Rank Up a Commando Lieutenant Colonel
Rank Up a Commando Colonel
Rank Up a Commando Brigadier General
Rank Up a Commando Major General
Rank Up a Commando Lieutenant General
Rank Up a Commando General
Kill the Rocket Bros in Mission Pack 2
Get Major Wood in Mission Pack 3
Defeat the Anvil in Mission Pack 3
Destory all the Bombs in Mission Pack 3
Rescue Captain Gary in Mission Pack 4
Survive the Horror in Mission Pack 4
Rescue the Bunnies in Mission Pack 4
Kill the Monster Yeti in Mission Pack 5
Kill the Giant Gator in Mission Pack 5
Kill the Queen Beetle in Mission Pack 5
Win Bumper Tires in Mission Pack 6
Defeat Boss Bomber in Mission Pack 6
Survive the Ice Caves in Mission Pack 6