Collect all crystals.
Collect all diamonds.
Find the way out.
Explore a level to a depth of 20 chests.
Instantiate 500 rooms.
Unlocked by unlocking the Recursion achievement.
Hey, this is fun!
Create an impossible situation.
Transform 50 ooblecks.
Collect all crystals and diamonds in The Oobleck Conundrum.
Enter a room that no longer exists.
It's good to have a hobby.
Enter 100 cauldrons.
Collect all crystals, diamonds and rubies in The Last Tapestry.
Another ridiculous hidden achievement.