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
Let Charles the snail fall down a long distance
Release the corruption core from its container
Seal the Corruption
Have Charles the snail witness the game's finale
Break a total of 50 pots
Break (almost) nothing during a playthrough
Beat the game within 15 minutes