The Warhammer 40,000 Special Pack Add-on for PowerWash Simulator has 10 achievements.
Complete the Land Raider job
Complete the Redemptor Dreadnought job
Complete the Rogal Dorn Battle Tank job
Complete the Imperial Knight Paladin job
Complete the Thunderhawk job
In the Land Raider job, complete the "Ultramarines II" Plaque first
Completely clean the Redemptor Dreadnought using only the yellow nozzle
In the Imperial Knight Paladin job, complete the Tilt Shield and Tilt Shield Purity Seals first
In the Rogal Dorn Battle Tank job, complete the Stowed Shovel first
In the Thunderhawk Job, complete the Retro Thrusters first