Here is the full list of all 24 Superflight achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Explore 100 maps.
Gain 40.000 points in a single run.
Crash 300 times.
Explore 50 maps.
Gain 20.000 points in a single run.
Explore 25 maps.
Crash 150 times.
Crash 50 times.
Gain all three praises in a single run.
Loose 10.000 points in a crash.
Enter the zen mode.
Inverting the steering axis? Seriously, that's just wrong.
Complete a 10.000 points combo.
Complete a 5.000 points combo.
Gain the "Godlike!" praise.
Enter a seed and create a map.
Gain 10.000 points in a single run.
Reach the end of a map.
Gain the "So Close!" praise.
Gain 5.000 points in a single run.
Complete a 1.000 points combo.
Complete your first run in Superflight.
Gain the "Awesome!" praise.
Travel through a portal.