We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
There are two achievments, one for playing 5 games of each mode, but the OP is talking about the other ones. Each of the MP maps is set in one of three catagories ( I believe artic, north sea and Africa) there is an achievment for winning three mp matches
one all the maps in each catagory; and another for winning 3 games on all maps for a total of 4 achievments