Here is the full list of all 12 Car Dealership Simulator achievements.
You sold your first car.
You have purchased your first car.
Food tastes great here!
5 cars for sale.
8 cars for sale.
Excellent customer respect.
You reached 1 million money.
Buy a luxury car.
You went bankrupt.
Play 100 days.
Play 300 days.
You got married.