Here is the full list of all 23 Krautscape achievements.
Finish Build tutorial
Finish 10 split-screen races
Build 1000 track elements
Finish 10 LAN races
Stay in the air for 90 seconds
Fail to land after more than 60 seconds in the air
Finish Fly tutorial
Finish Drive tutorial
Land on the same track element after more than 60 seconds of flying
Win an online game without using your wings
Win an online game without resetting the car
Win 5 online Snake races
Win 5 online Ping Pong races
Win 5 online Collector races
Finish all Drive tracks with medal
Finish all Drive tracks with gold
Finish all Fly tracks with medal
Finish all Fly tracks with gold
Reach 50 points in Build mode
Reach 100 points in Build mode
Reach 150 points in Build mode
Win all gold medals
Build 10000 track elements