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.
Enter the Chaos Trials in co-op mode
Unlock 99 relics
Unlock 50 relics
Defeat Taffy 5 times
Unlock 99 arcana
Unlock 3 chaos arcana
Destroy 99 paintings during the Chaos Trials
Defeat Master Sura
Land a 50 hit combo on any boss
Unlock 50 arcana
Unlock 9 outfits
Defeat a boss without taking damage
Hold 4 cursed relics
Defeat Frost Queen Freiya
Defeat Earth Lord Atlas
Defeat Flame Empress Zeal
Complete the Tutorial
Hold 999 chaos gems at one time
Clear the Chaos Trials in 25 minutes