4 votessupersumer commented
I might have a potential fix to this, or at least a way to get the trophy to pop.
I beat the game on Crushing, and all the trophies popped except for the one for Hard. A few days later I randomly clicked "Credits", I didn't even load the game, didn't do chapter or encounter select, just went to Bonus and then Credits and the trophy popped. So I guess just watch the credits and it should pop up.