As a reply to some of my messages on Stackable Games, here is the link to a dedicated page. As I have mentioned before, this method of gaining additional achievement points on the same game can be expensive, if you choose to stack up regional games.

But if you got money to burn and you want to play the same game again, then there are quite a few games to get into.

New Halo 3 Achievements

Found this on one of the many forums I visit. It looks like Halo 3 is to get a DLC with new achievements? Information is not clear at the moment, but I will let you know as soon as I find out. Click here for more of the shots and very little info.