Here is the full list of all 37 Bus Simulator 21 achievements.
Get a 5 star rating on a route
Wake up an asleep passenger
Create a new route
Take over a bus from another driver using the route menu
Customize a bus
Buy a bus in a dealership
Finish your first mission in Angel Shores
Catch a passenger without a valid ticket
Finish the tutorial in Angel Shores
Level up a bus stop
Buy your first bendy bus
Buy your first double decker bus
Finish 10 missions in Angel Shores
Finish 20 missions in Angel Shores
Finish 30 missions in Angel Shores
Unlock a bus stop in every district of Angel Shores
Unlock the transit station
Charge an e-bus using the loading station
Change a value in the timetable
Drive 1000 kilometers
Have ten buses of the same model
Create a perfectly balanced route with at least 10 bus stops
Complete a slalom course without running over a traffic cone
Use 10 different decals on a single bus
Buy all buses from the base game
Finish all missions in Angel Shores
Finish all missions in Angel Shores and Seaside Valley
Find a collectible in Angel Shores
Find 10 collectibles in Angel Shores
Find all collectibles in Angel Shores
Find the haunted house in Angel Shores
Find the "SAM" statue in Eclipse Bay
Find the "SAM" statue on Gold Island
Finish a mission in Seaside Valley
Finish all missions in Seaside Valley
Find five collectibles in Seaside Valley
Find all collectibles in Seaside Valley