Here is the full list of all 21 Galactic Lander achievements.
Hover in place for 10 seconds.
Hover in place for 20 seconds
Hover in place for 30 seconds
Do a flip!
Do two flips!
Damage your ship's components 50 times
Damage your ship's components 100 times
Damage your ship's components 200 times
Damage your ship's components 600 times
Complete six singleplayer levels
Complete six co-op levels
Complete all singleplayer levels
Complete all co-op levels
Complete three levels without damaging a single component
Complete five levels without damaging a single component
Complete ten levels without damaging a single component
Upload three levels to the Steam Workshop
Complete a level with no legs
Complete three levels in no-gravity mode
Witness the rare sight of a buried ancient fighter-ship from a time long ago.
Discover an easter egg within the level editor tutorial