Here is the full list of all 37 Gas Station Simulator: Prologue - there are Early Days achievements.
You've been visited.
Complete a race in the RC Car.
Fuel a car within 0.01L of the requested fuel.
Cleaned up 100 Floor Stains
You let it run away from you didn't you?
Gas Station Simulator Prologue Completed
Painted 25 Objects
Served your first customer in the shop.
Cleaned up 50 Trash Items
Bought / Found a decoration
Cleaned up 25 Floor Stains.
Cleaned up one floor stain.
Painted 10 Objects.
Fuel a car within 0.1L of the requested fuel.
Painted something!
Fuel a car within 0.2L of the requested fuel.
Ordered a Garbage Truck to collect your trash.
Picked up a trash item.
Fuel your first car.
Ordered fuel to be delivered to the Gas Station.
You found "Rudy"
Hit trash can with a score of over 25!
Hit a trash can!
Served 50 custoemrs in the shop.
Got a tip during a minigame.
Got a total of 10 tips during minigames.
Got a total of 50 tips during minigames.
Hit trash can with a score of over 50!
Fueled 10 cars.
Fueled 50 cars.
Broke into a car trunk.
Broke into 10 car trunks.
Broke into 20 car trunks.
Scared off Dennis.
Cleaned up 100 Trash Items
Managed to get really high into the air.
A flying car. Who would have thought? Not us.