Knockout City

So if your like me and you were wonder why this didn't unlock after winning many games with your buddies, you have to go into the game and add them as a KO City Friend, it doesn't count to just be Xbox friends.

From the hideout hit start > go to social >

if your friend is in your group go to their name hit A > Add KO City Friend.
if your friend isn't in your group tab over to friends and find their name and hit A > Add KO City Friend.

Now win 10 matches with your friends and you'll net this achievement.