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