Since this is the internet, and people tend to be stupid when using it, I just have to ask.
You do realize that those 500km’s (I think it is) to get the trophy have to be done in one single session? Not particularly in one single race, but in one “stint”.
You can’t race for 350 km’s, turn off your PS4 to have dinner and then do the remaining 150 km’s after dinner. You can however do 250 km’s, go play around in the livery editor/photo mode/sport mode or whatever and then go and do the remaining 250 km’s.
As long as you don’t close the game in between your “stints”.
That’s how I got it, and I wasn’t even trying