Here is the full list of all 11 bit Dungeon III achievements.
Free Sophia's Soul.
All Archons have been defeated.
Assisted all neutral monsters.
Gain 50 souls from defeating bosses.
Kill 50 players and take their souls.
Equip all rune slots with rarity 3 and above.
Hunt down 25 elite monsters.
Unlock the Shade race.
High equipment rarity total has been reached.
Kill 100 Fiends
Defeat the Monad in the Darkworld