To get this achievement and the one moving backward, I used level 4 in world 1 (Western). There is a very nice circle in the middle of this level you can travel around and quickly get to the exit while you think you have traveled enough. You get around a little bit more than 100 km per minute. This way you can calculate how long to drive around in the middle of this level before going to the exit. You'll have to finish the level for the distant to count toward the achievements.