It's not a bad thing. I've also seen you around. You have no avatar correct? FootballPsycho was the first person to poke around on my profile. No, you didn't add me. Short term memory loss is awesome. Sometimes I can't remember what I did two minutes ago. Great when you're having a conversation with people.
I can't recall exactly, but I know I was trying for other achievements first, hoping to get this on the way. So, for the 3 wins in a row achievement I tried to switch teams; etc. I never really kept tracked of what teams I used so towards the end I just switched teams and hope to get it. Felt like I did 11 or 12 (but it likely was 10) but I did get it.
Really haven't heard of any banter on XBOX 360 on this one being glitched, so sorry that I can't really offer any help