(adsbygoogle = window.adsbygoogle || []).push({}); You must login or register to view this content. this is link i have found a couple of them and u can read them. does anyone know if they do anything

They don't do anything but help you better understand the story line of Halo Reach, and how it all came to be. There is no achievement to finding them all, and everything they have to say can be found on Youtube.