Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Ah'n'gha throdog r'luhhor	Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn.
Come Get Some	Complete the game on the standard difficulty.
Double-edged Sword...	Slay the Satan himself.
Evil Nightmare	Complete the game on the hardcore difficulty.
Galileo	Find 50 secrets.
Industrial Age	Destroy the Massive Tank.
Lock 'n' Load	Buy 10 upgrades.
Magellan	Find 30 Secrets.
Marco Polo	Find your first secret.
Piece of Cake	Complete the game on the easiest difficulty.
Ponce De Leon	Find 10 Secrets.
Small step for a Warlock...	Slay The Sorcerer.
Weird Cat	Slay the Sphinx.