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.
Unlock 50 relics
Defeat Taffy 5 times
Defeat a boss without taking damage
Unlock 50 arcana
Land a 50 hit combo on any boss
Destroy 99 paintings during the Chaos Trials
Unlock 9 outfits
Defeat Flame Empress Zeal
Defeat Frost Queen Freiya
Defeat Earth Lord Atlas
Enter the Chaos Trials in co-op mode
Complete the Tutorial
Defeat Master Sura
Unlock 99 arcana
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