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