Just read a news article over at Destructoid about Gears of War achievements unlocking content in Gears of War 2. I think that this is awesome, achievements was one thing for replayability but now unlocking new secrets in sequel games is the next step!

I just hope that EPIC Games didn't add the stupid grind achievements for multiplayer that they did on Gears of War (such as: Kill 100 enemies using the Torque Bow, etc.)