Glitched Achievements

While a friend and I were getting 100% achievements on this game we round that we each had a glitched achievment, mine was getting 100 MP kills and his was winning 10 tdm matches. After brainstorming we found out why. After getting "you can't touch this" (win 5 mp games in a row) all (or at least multiplayer) achievements are glitched.

The solution we found is actually pretty simple....just reinstall the game. After we each reinstalled for separate reasons at separate times, we each found that our achievements started working again.

Hope this helped you and if it didn't good luck to you.