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