Thnx for the guide. ive used it with a couple of friends and it works like a charm. We used 5 extra profiles to get one of them at rank 50. After that we played our own profiles against the extra profiles (selecting them by rank up).
After the first of us got the achievement we traded placed and did the same cycle again. It will take a lot of time but its worth it! Getting the extra profiles ranked up takes the most tike btw.