i noticed the that "Fly Swatter" trophy is missable where you must kick a guard while riding the flying machine, and if you failed to get it then you will have to start the game again to get it. but i started thinking, so i thought just incase you miss starting the whole game again will be a pain, so i thought, and while you are on that mission and about to ride the flying machine. Quit the game, make a new profile and copy the data over and if you miss the trophy you can transfer the save data back again