I found a pretty easy race to get this achievement after initially struggling to get anywhere near the 100k mark. If you enter the Sports Utility Heroes Event and go to the West Hill Cross Country Circuit this achievement becomes a breeze. I managed to hit 100,000 in my first lap and then 120,000 in my second without really putting too much effort into it.
The circuit itself is designed with wide corners perfect for drifting and has jumps that you can grab air dotted all over. If your multiplier is about to finish then remember to;
- Draft opponents
- Over-take opponents
- Run over bushes (this comes in handy when you are on a long, flat straight).
Hope this helps!