i also have his problem here are some examples
Did a 25% race on wets in spain and it didn't unlock 2 challenges (Spain wet and 25% on heavy rain).
Another example is the win from pole in hard ai challenge on x track. I did it and still didn't unlock the challenge.
Another example is the win GP with x driver... again I did it and it didn't unlock.
1. challenges do not unlock
5. Happens all the time
6. I’ve restarted the game and console multiple times