When I started looking through Youtube.com while uploading game ending; I came upon a video with 1000 achievement points that you can earn in just 2 minutes. I thought that was just too good to be true so I rented Avatar: The Last Airbender: The Burning Earth. After putting it in and remembering to just press the B button on the 360, the rest was a piece of cake. Enjoy.
P.S. I would have just uploaded this from Youtube.com, but I just don't know how to.