Here is the full list of all 21 Autobahn Police Simulator 2 achievements.
Show mercy with the truck driver and let him go
Join the autobahn police
Buy all upgrades in TRAINING
Buy all upgrades
Buy all upgrades in GARAGE
Buy all upgrades in STATION
Gain 50,000 Influence Points
Discover all 10 memorials in the world
Unlock all Fast Travel Stations in the world
Find all 20 rubber duckies
Unlock and finish Konrad's mission
Finish the campaign
Arrest the mastermind behind the smuggler ring
Interrupt the big drug deal and catch the dealers
Finish a traffic control 100% completely
Complete 5 car chases successfully
Find and arrest the stone thrower
Enjoy a donut in all 5 donut shops
Arrest the truck driver
Finish an accident 100% completely
Drive at least for 10 seconds 200 kph or more