We know you're probably looking forward to the release of Gears of War 2 this November. However, it looks like you may want to pop in the original for a bit and make sure you've got all those achievements. Joystiq gives us some information from the recent Comic-Con, straight from Cliff Bleszinski. He announced that earning achievements from Gears 1 will unlock certain features in Gears 2, like extra playable characters, for example. At this time, it is unknown which achievements he is referring to. You may just want to get as many as possible in the meantime. Personally, I think this is a pretty neat little bonus for those who have played the first game, though I certainly hope there's an alternate way to get these same features unlocked.