Here is the full list of all 17 Recursed achievements.
Explore a level to a depth of 20 chests.
Collect all crystals, diamonds and rubies in The Last Tapestry.
Collect all crystals.
Collect all crystals and diamonds in The Oobleck Conundrum.
Arrive nowhere.
Collect all diamonds.
Enter a room that no longer exists.
Transform 50 ooblecks.
Hey, this is fun!
Do nothing.
Find the way out.
Enter 100 cauldrons.
Create an impossible situation.
Instantiate 500 rooms.
Unlocked by unlocking the Recursion achievement.