From the launch date of the game the below trophy was unobtainable. Then, around 11th January 2016 something was fixed somewhere (specific details are unknown, although there was no patch to the game itself at the time) such that this trophy is now able to be unlocked.
If you have fulfilled the requirements (spending 600 minutes out on track) previously, you will most likely have the trophy unlock automatically for you, even without needing to load up the game again. If this still has not happened for you, you can try to force the unlock by playing the game and starting any game mode. As soon as you take control of the car on a lap, the trophy should then unlock.
Otherwise, if you have still not yet spent enough time out on track.
Now that will unlock the Platinum.
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