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