Here is the full list of all 22 Dog Duty achievements.
Defeated an enemy squadron on the Truck.
Your vehicle has been armed.
Destroyed the Octo Tank
Destroyed the Octo Jumper
Destroyed the Octo Plane
Finished the game
Found a deeper layer
Cleared all locations
Rescued Rebecca
Rescued Paula
Rescued Madness
Conquered all armor depots.
Stacked a good amount of enemy goods
Destroyed all enemy communications devices.
Won a battle with every vehicle.
Defeated an enemy squadron on the Hoovercraft.
The game finished before even starting! How innovative!
Defeated an enemy squadron on the Boat.
Found an abandoned car in the Desert.
Rescued Kilmer's bootleg character.
Rescued Liza.