Here is the full list of all 19 FlyN achievements.
Stop the Garbage Collector
Bounce 5,000 times.
Dash 1,500 times.
Stop the Telescreen.
Buy an illustration.
Stop the Portapotree.
Glide for 10 minutes.
Stop the MX_Tripator.
Return to the checkpoint 50 times.
Stop the MX_Tricotor.
Die more than 50 times in a single level, then complete it.
Sing for 2 minutes.
Stick for 1 hour.
Complete the Tricoton's bonus levels.
Complete the Tripatio's bonus levels.
Complete the Trilab's bonus levels.
Complete the Electri's bonus levels.
Complete all the bonus levels.
Buy all the illustrations.