Looking for Gears of War 2 players for help in achievements?

I need help getting some of the add-on achievements for Gears of War 2 for the Xbox 360, mostly the ones involving horde mode. I'm willing to help boost other achievements in return. My Xbox Live gamer tag is xxxSniper0xxx. The character after the "r" is a zero, and there is no period at the end. Don't message or friend me unless you have all of the maps.