Here is the full list of all 15 [it's possible] achievements.
Die for the first time
Die 25 times
Die 50 times
Die 100 times
Die 200 times
Die 300 times
Die 400 times
Die 500 times
Die 1,000 times
Create over 1,000 blood particles
Create over 9,000 blood particles
Create over 20,000 blood particles
Kill yourself
Beat the game
Reset your cloud save