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 99 arcana
Defeat Frost Queen Freiya
Unlock 9 outfits
Destroy 99 paintings during the Chaos Trials
Enter the Chaos Trials in co-op mode
Defeat Flame Empress Zeal
Unlock 50 arcana
Defeat Earth Lord Atlas
Land a 50 hit combo on any boss
Complete the Tutorial
Defeat Master Sura
Unlock 50 relics
Unlock 99 relics
Hold 999 chaos gems at one time
Clear the Chaos Trials in 25 minutes
Hold 4 cursed relics
Unlock 3 chaos arcana