"Complete 3 Xbox LIVE matches".

I've completed much more than three matches on live (i'm level 11 now), different game modes, different days, 3 matches in a row, etc. But this achievement is not unlocking for me.

Any suggestions?

I've tried:

1. Recovering my GT and playing more than 3 matches.
2. Recovering my GT on a different console and playing more than 3 matches.
3. Recovering my GT on my main console again and playing more than 3 matches.

All these times include clearing the cache.

Results: Still Screwed.

I even got the Nomad (Multiplayer: Play a full game on every map) in the process.

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If you have secondary account, have you tried it on that?