There's some trophies that people have not been getting from the plat-saves of 50 Cent, so I made a backup of my save at certain points in my playthrough. These saves and a platsave should cut down your time to plat quite a lot if you want to avoid some of the horrible grinding.
Trophies from these saves are:
Wanna-be: 15 Silver Badges
Hardcore: 15 Gold badges
Get a gold badge in any of the remaining levels.
Play the last chapter as a member of G-unit
Gangsta - Normal Difficulty
Bulletproof - hard Difficulty
Continue the game. The last chapter is just a couple minutes of driving
This is a really easy game, but following a walkthrough to get all the collectables is a very boring grind which these will help you avoid.