Here is the full list of all 10 Spellbound Spire achievements.
Make an object float in zero gravity
Travel a total of 100 meters
Find the secret treasure room
Release the corruption core from its container
Seal the Corruption
Have Charles the snail witness the game's finale
Let Charles the snail fall down a long distance
Break a total of 50 pots
Break (almost) nothing during a playthrough
Beat the game within 15 minutes