Full list of all 10 140 achievements worth 1,000 gamerscore. It takes around 5-6 hours to unlock all of the achievements on Xbox One.
Complete the first stage
Complete the second stage
Complete the game
Complete the first mirror stage
Complete the second mirror stage
Complete all mirror stages
Die 63 times.
Beat the first boss without jumping.
Beat the second boss without dying.
Beat the third boss without dying.