In case anyone missed it and is trying to get this achievement - it is glitched and from what I understand will never get fixed/patched. This is the achievement for getting 1st place in each of the maps in any game mode in ranked multiplayer. You should only need 1st place once on each map, and you don't have to do it on every game mode, any mode works as long as you do it once per map. I've done this but it doesn't unlock, and after fishing around, almost nobody has gotten this achievement since a patch a long time ago. From what I understand, you can get the achievement, but nobody knows exactly how, it will just happen sometimes. For example, one guy reported that his friend got it after a map that his friend placed second on, didn't even get 1st place. It's a 0 point achievement, so it won't affect your gamerscore, but for people just wanting the bragging rights, don't plan on getting this one and I wouldn't worry about spending great deals of time trying to get it, just FYI. If anyone does know of a sure fire way of getting this achievement, please let us know by posting here. Thanks!

I've seen people with this achievement and they have finished 1st on each map to get it. I have finished 1st on each map and i don't have this achievement, i agree with you that it is glitched but then there's something telling me it isn't, just maybe need to play through the maps again and again whilst going for the upgrading all weapons achievement and hope it will pop.

If anyone has got this achievement post here on how you did it, and if it popped first time of trying so we can get it the same way, thanx....

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You wanna boost?

Supposedly a patch bugged it.  People early on got the achievement, but afterwards either nobody got it, or somehow got it with weird situations (such as getting 2nd on a map).

There was a post or email or announcement at one pont from a CSR for the game that said it was never implmented, but I think that's incorrect.  I believe it was, but they accidentally bugged it at some point.  Since it's a 0 point achievement, MS probably never forced them to fix it.