Full list of all 101 Gas Station Simulator achievements. It takes around 35-40 hours to unlock all of the achievements in the base game on Windows.
The base game contains 81 achievements, and there are 3 DLC packs containing 20 achievements.
Fed the Sewer Alligator
Unlocked the Car Wash
Upgraded the Car Wash to Level 2
Upgraded the Car Wash to Level 3
Upgraded the Car Wash to Level 4
Upgraded the Car Wash to Level 5
Washed 1 Car
Washed 10 Cars
Washed 50 Cars
Returned the fish to their "natural" habitat.
Hit the coconut at least once from each of the 3 spots near the cauldron
Make an offering to Chunchumanchu
Drive the shark away before it manages to devour its first victim
Buy all new oceanic landmarks
Refuel 100 boats
Buy all station upgrades
Upgraded Drive-in Cinema to level 10