Here is the full list of all 15 bit Dungeon II achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Kill the king of Skeletons.
Slay the Fire Nob Glob.
Destroy the Soul Collector.
You have died. You have all lost things. You can not take your possessions with you to the next incarnation.
Kill the leader of the Thief Kings, The Cursed Wizard!
Find an epic-quality weapon.
Face The Eater!
Reach level ten.
Kill a mini-boss.
Enter into the Dark World.
Free the ghost from her grave.
Slayed the Fiend.
She rules an army of beasts in the Black Church, defeat The Yaldabaoth.
Slay the Demiurge.
Tis this a demon?