Here is the full list of all 23 Wizordum achievements.
Complete City of Ember
Break 100 objects
Complete Grim Haven
Empty the whole water basin
Hold all keys at once
Complete Mourning Grounds
Complete Murky Wastes
Complete Canal Streets
Kill the Treasure Goblin before it disappears
Complete Grimbrook Outskirts
Complete Episode 1
Finish any level 100%
Beat any level's par time
Finish any level in the Timed Run mode
Shatter 6 or more frozen enemies at once
Collect 2500 treasure items or more
Finish any user level
Create and playtest your custom map in the map editor
Unlock and loot all Gold Treasure chests in any level
Find the Secret level in Episode 1