Welcome everyone !
This achievement works and is not bugged

1. You need two gamepads
2. Game setup: Bristol dirt / 2% race length
3. Now you have to drive five races winning alternately.

Race 1 - Player one gets 23rd place on fnish and second player gets 24th
Race 2 - Player one gets 24th and second player gets 23rd
Race 3 - Player one gets 23rd and second player gets 24th
Race 4 - Player one gets 24th and second player gets 23rd

Now it's a draw. Now it is enough to take a higher position at the finish than player two

Race 5 - Player one gets 22nd or better and second player gets 24th.

Have fun!