Here is the full list of all 16 Tetradecagon achievements.
Enable epileptic friendly mode.
Die immediately after the grace period on the first level.
Suck 500 times.
Perform a 540 while bouncing the ball.
Perform a 360 while bouncing the ball.
Die 100 times.
Beat your highscore 10 times.
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.
Use the Konami Code.
Beat the highest level, Icosagon.
Beat your highscore 50 times.
The illusion of allusion.
Glitch the ball out of the polygon.