Today Epic released 8 new achievements for gears of War bringing the total gamerscore to 57 achievements 1250 points
http://www.achieve36...ame/gearsofwar/THIS! IS! ANNEX! -40GS
Complete 100 multiplayer matches of 3+ rounds in Annex and capture 3 objectives in each match.
Inconceivable! -30GS
Win 20 rounds of multiplayer matches in Annex by fewer than 5 points.
Nub Pwn3r - 30GS
Win 20 rounds of multiplayer matches in Annex by shutting out the opposing team.
You Down With E.P.I.C? -30GS
Win a multiplayer match of 3+ rounds in any game type on 6 different downloadable maps.
Green Thumb -30GS
Win 20 multiplayer matches of 3+ rounds in any game type on the Garden multiplayer map.
Mind the Gap -30GS
Win 20 multiplayer matches of 3+ rounds in any game type on the Subway multiplayer map.
Purdy Mouth -30GS
Win 20 multiplayer matches of 3+ rounds in any game type on the Bullet Marsh multiplayer map.
All That Juice -30GS
Win 20 multiplayer matches of 3+ rounds in any game type on the Process multiplayer map.
All of these achievements can be earned in player match as well as ranked match (it doesn't matter)
Also I've heard that these are somewhat glitched... and if you've met the requirements for one of them but it hasn't unlocked yet then you simply need to recover your account and play the game mode or level again for the achievement that was stuck.
so if you've won 20 matches in the garden and didn't get the achievement, recover your account and win one more match in the garden to get it.