Here is the full list of all 8 Hoverflow achievements.
Successfully chain 10 bunny hops.
Finish a level with 200 speed.
Earn the gold medal for every level.
Discover every secret of the game.
Finish a level without touching the ground.
Finish a level without jumping.
Speedrun the game in under 30 minutes.
Overcome 60 obstacles in an infinity map.