No there isn't a trophy for sweeping, I just wanted to get the high reward, so dont restart your game!! But im on chapter 5 and the only difficult thing about the game so far is the weapon upgrading system which I enjoy but I know its gonna be a hassle getting components and knowing which is good for exp and the multiplier. Thank god I got the stragety guide just to make it easier, I didnt want to keep on getting on my computer for Gamefaqs plus theres pictures!