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