The Shrek Special Pack Add-on for PowerWash Simulator has 10 achievements.
Complete the Duloc job
Complete the Hansel's Honeymoon Hideaway job
Complete the Shrek's Swamp job
Complete the Fairy Godmother's Potion Factory job
Complete the Dragon's Lair job
In the Shrek's Swamp job, clean the Outhouse Door and Outhouse Door Handle first
In the Duloc job, interact with the Information Stand Lever
In the Hansel's Honeymoon Hideaway job, wait in the Onion Carriage for 30 seconds
In the Fairy Godmother's Potion Factory job, run on the Running Wheel for 20 seconds
In the Dragon's Lair job, clean the Gallery Tapestries last