In Uncharted 3, ND changed the requirements for crushing to allow you to unlock it after finishing the game on any difficulty and that has been carried over to the Last of Us. I finished on medium and now have the option for new game plus or survivor
The most efficient way to platinum it is to play any difficulty then survivor then survivor plus. That will unlock all difficulty trophies
As for collectibles, they are linked to your PSN id, so they carry over throughout. Personally, I looked everywhere in my first and got 104 collectibles, so will be using a guide next time







