I played a few multiplayer games with a friend this weekend against computer opponents and noticed that I didn't receive an achievement I know I should have earned. It was "Win a game as the Americans on any difficulty" and I was for sure playing as the Americans. The only reason I can think it might not have counted is that we were teamed up against the computers who were free-for-all.
We played two normal games before that, and I'm curious if those even counted towards my achievement progress. There is at least one multiplayer-specific achievement I earned then, so you would think everything else would count as well, right?