This is how me and my friend did it. Make your own map that qualifies for chaos with evolution items and some atv's. Set it to player match, chaos, 25 kills to win, 50% health, and whatever else you want (like max players with private slots). Kill your friend 25 times,then next round let him kill you 25 times (with feral punch). Now do the same rotation, but go for your road kills. After 2 rounds each (50 kills) you should have your road kill ach (yes early) now play another round and you should get your feral punch kills. (yes after only 25-50) Dont ask me how it works, but it worked for 3 of us. One has a PAL version and the other two have NTSC, although I dont believe that has anything to do with it.