Here is the full list of all 19 Wizard of Legend achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Defeat a boss without taking damage
Defeat Taffy 5 times
Unlock 9 outfits
Destroy 99 paintings during the Chaos Trials
Unlock 50 arcana
Hold 4 cursed relics
Defeat Frost Queen Freiya
Defeat Flame Empress Zeal
Land a 50 hit combo on any boss
Defeat Earth Lord Atlas
Enter the Chaos Trials in co-op mode
Complete the Tutorial
Defeat Master Sura
Unlock 99 arcana
Unlock 50 relics
Unlock 99 relics
Hold 999 chaos gems at one time
Clear the Chaos Trials in 25 minutes
Unlock 3 chaos arcana