It will take 5-6 hours to get all the wins for you and a friend
Step 1 - The person winning sets up a game :-
(Doesnt have to be these settings but its easier to find your boosting partner)
Step 2 - Person winning CREATES the match as the loser searches for the same settings via CUSTOM MATCH,The hosts name comes up before you enter so if there are a few names (very unlikely) You can choose your friends
Step 3 - Choose your teams and click through till the MATCH START,both press A to start match. As the loading screen comes up - The person LOSING quits to dashboard
Step 4 - Rinse and repeat
When i did this it didnt count the games / losses / disconnects for me but did for my friend so my stats turned out looking good lol
Also this method seems the quickest and i have gained the achievement so use with confidence!!!