The King Of Speed Achievement
The King Of Speed20
Finished 1st in a Grand Prix tournament at Expert difficulty
This shouldn't be too difficult. Just make sure you read the points table and make sure you can either surpass them with driving skills or bring them down a few rankings by mercilessly shooting them with whatever you have if you find yourself lacking in that particular race. Never give up either. Just because you have one bad race doesn't mean it's over. The AI could suddenly have 3 bad races. You never know until you try until the end.