No missable achievements (plus 14 unknown)
Sign in with Steam or Xbox to track your progress, and:
Fall into the lava.
Defeat Betsy's Challenge.
Win the challenge level at the end of the first set of levels, necessary to progress the 'story'.
Beat Neil's Challenge.
Defeat Kentony's challenge.
Literally just quit the game mid-level. Rage!
Die 100 times.
Win a multiplayer match.
Beat Cedar's Challenge.
Beat Kentinator's Challenge.
Challenge a friend to beat your score.
Beat 99% of all players on a level.
Publish a level to the Steam Workshop.
Earn a Bronze medal on all levels.
Earn a Silver medal on all levels.
Earn a Gold medal on all levels.
Beat all bonus levels
Press reset over 9000 times.
Earn a Rainbow medal on all levels.