I got this on the Level 1 Malaysia Rally, 3 races into the career. It's pretty short, has predictable gravel, and is pretty flat with wide roads. Just take your time, accelerate slowly, and try not to pull above 2nd or 3rd gear, as braking on gravel is fairly hard to control.
This achievement DOES NOT unlock if you collide with ANYTHING, even a roadsign. I would've gotten on the Japan rally, but I hit one road sign, nothing else, and it didn't pop. The only thing your car is allowed to make contact with is the road.