Here is the full list of all 63 Car Detailing Simulator achievements.
Return dirty
Long session
Fix trash
Use trash can
Fix seat
Use sand paper
Use soft brush
Use wide brush
Buy seat toolkit
Buy interior toolkit
Buy wheel toolkit
Buy garage upgrade
Buy window toolkit
Wash 1 car
Get 2 rep
Fix scratches
Use hand polisher
Use flashlight
Buy finish toolkit
Open memory
Take photo
Buy body toolkit
Buy one toolkit
Use seat spray
Finish tutorial
Use window spray
Use vacuum
Use rag
Use pressure washer
Buy lights toolkit
Use automatic polisher
Use paint meter
Use sponge
Use small brush
Fix body
Fix windows
Fix wheels
Finish game
Wash 10 cars
Wash 50 cars
Wash 100 cars
Wash 500 cars
Get 5 rep
Get 10 rep
Get 15 rep
Make money
Buy all toolkits
Buy shed car
Buy all upgrades
Buy garage
Overtime
Water computer
Sell lower price
See credits
Buy auto salon
Repair garage
Fix ufo
Find unique
Car 1 minute
Pressure washer time
Find turtle
Stairs ride