I see there are other guides, but mine is meant to not only get you the "I am Speed" trophy, but also most of the miscellaneous ones, as well as all of the memories, scratch points, and badges that aren't in the two major hub areas so that any replaying will be limited. It's pretty efficient as I finished in 1hr 48mins, and that was with a weird glitch that cost me 6 minutes. Following this the only thing you'll have left to do is all of the collectables in the Slums and some in Midtown. Everything else is covered.