Here is the full list of all 16 Tetradecagon achievements.
Glitch the ball out of the polygon.
Beat the highest level, Icosagon.
Beat your highscore 50 times.
Suck 500 times.
The illusion of allusion.
Use the Konami Code.
Perform a 360 while bouncing the ball.
Perform a 540 while bouncing the ball.
Die immediately after the grace period on the first level.
Die 100 times.
Beat your highscore 10 times.
Die 5 times on one level without progression
Lose control of the ball seconds immedietely after bouncing it.
Beat your highscore.
Die for the first time.
Enable epileptic friendly mode.