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