Gears of War 2 has given us 7 new achievements, which may be obtainable right now! can be earned after the  title update comes out. The achievements can be earned by purchasing the Flashback or Combustible Map Packs, and can net you an additional 175 points if you are successful.

The new achievements can be viewed below:

Skeletons in your Closet Complete waves 1 through 10 on all Flashback Map Pack maps in Horde (any difficulty)	20
More Mystery, Less History Win a multiplayer match on each of the 5 Flashback Map Pack maps (any mode except Wingman)	15
Bound by a Shared Past Win a Wingman match on each of the 5 Flashback Map Pack maps	15
Trial by, and on, Fire Survive first 10 Horde waves on Combustible Map Pack maps as a team	20
The Roof! The Roof! The Roof… Win a multiplayer match on each of the 3 Combustible Map Pack maps (any mode except Wingman)	15
Forged in the Fire Win a Wingman match on each of the 3 Combustible Map Pack maps	15
Annex: Now With Execution Rules Win an Annex match on each Flashback and Combustible Map Pack map (public matches only)	75