Got the platinum last night. Only need to chop off a handful of tenths (at 1:07.5xx right now) to gold the Senna Brands Hatch challenge and I'll have that last trophy I need for truly 100% trophies. Nowhere near 100% game completion though. I believe I'm at around 78%. Still have plenty of challenges I haven't bothered with, and a handful of races in a couple series I haven't done. It was so satisfying getting the plat! Never got it for GT5, and that's because the remaining things I need to do are miserably difficult (usual Redbull events, Alfa Eiger TT, Loeb rally event, etc.).