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