Ya you should be fine. As long as you achieved all but the multiplayer trophies and the trophy for beating Hard mode you're golden. I did the same thing. One trophy if you haven't gotten it already that you might want to achieve on an easy or normal file is the Master Protector trophy for getting through a gather without taking any damage or letting anyone get to your Little Sister. I got this trophy at what I believe to be your first gather opportunity in Ryan Amusements. I just set a crap-ton of trap rivets along the balcony and staircases as well as on the barel and kept my eyes pealed for any movement.