Be sure to enable locations before doing this.
To get this achievement, all you have to do is jump in a vehicle and go at least 35 mph. I was unsure of whether or not that was really how you got it, but I was willing to try it, so I got in my car, and a few seconds after I was going 40 mph, the achievement unlocked.
Note to all gamers, do not drive yourself while doing this. Jumping in the car implies that someone else is driving at the time. You have been warned!