Ah fun stuff. Was about ten minutes away from getting my last achievement when the game froze on me. Booted it back up so I could finish off this game and realized my campaign progress and challenges had been erased. Still have the rest of the achievements and my unlocked guns and outfits but have to start campaign from the beginning.
Hopefully it won't take too long to blow through the game on normal and finish off Sanchez in the ring for the faith can move mountains achievement. Might even be fun after the pain in the ass hard difficulty was.