Here is the full list of all 21 Action Henk achievements.
Ragequit the game during a level.
Publish a level to the Steam Workshop.
Die 100 times.
Jump over the barrier.
Beat Cedar's Challenge.
Defeat Kentony's challenge.
Beat Neil's Challenge.
Defeat Betsy's Challenge.
Fall into the lava.
Beat Kentinator's Challenge.
Beat Action Henk in the City.
Earn a Bronze medal on all levels.
Earn a Silver medal on all levels.
Earn a Gold medal on all levels.
Earn a Rainbow medal on all levels.
Beat all bonus levels
Challenge a friend to beat your score.
Beat 99% of all players on a level.
Win a multiplayer match.
Press reset over 9000 times.