Here is the full list of all 16 P.A.I.N.T. achievements.
Reach a score of 1 or higher
Complete your first objective
Play as Rebel
Complete the vending machine objective
Complete the poster objective
Interact with the crashed RV
Let an enemy get defeated by the cutters
Jump into the pool of black paint
Reach a multiplier of x100 or more
Try to leave the HUB
Complete the lockdown objective
Complete the fountain objective
Complete the broken machine objective
Reach a score of 1000 or higher
Reach a score of 10000 or higher
Reach a score of 100000 or higher