Here is the full list of all 18 Stilt Fella achievements.
Fall 30 times on the highway.
Fall 50 times in one level.
Complete level 11.
Fall 25 times in one level.
Complete level 7.
Complete level 3.
Complete the tutorial.
Complete level 14.
Reach Cyberworld.
Complete level 24.
Complete level 27.
Complete level 32.
Complete level 38.
Reach the finals.
You won the game!
Started Iron Fella mode.
Only the hard half left!
Seriously, how did you even do that?