Won the game on all difficultys. When you reset on a new difficulty then you can't unlock the med or the extra mags. A work around might be to let yourself get shot and always reload till you do the last difficulty. Reason being that in the maximum difficulty the extra mags and the health pills are needed the most. I am not sure if this works. Maybe you cannot unlock them because of some bug that occurs when resetting the game on a new difficulty and not because you have already unlocked it before.