Quote Originally Posted by Chaosblade View Post
Yes, I played on Hard and it unlocked each lower difficulty's achievement.
Thank you for telling me this just as I'm ready to finish my Hard run following my runs on the earlier three...

...although I probably needed the practice anyhow. I found Very Easy difficult considering that I missed two of the weapon power-ups... which basically made me attack everything after the Devil's Corridor with a bendy straw.