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