With the Xbox One, every single achievement includes a 1920×1080 image that is related to the achievement itself. Halo: The Master Chief Collection is no exception for this. The game features 4000 Gamerscore and up to 400 achievements!
Below you can see a few images that will be used for the achievements in Halo: The Master Chief Collection. You can see some in-game screenshots of Halo CEA, Halo 2 Anniversary, Halo 3, Halo 4, some new skulls that will be featured in Halo 2 Anniversary, some concept art for various Halo games and some images from the Halo 2 Anniversary remastered cutscenes. It should be worth nothing that there are images here which could spoil various pieces of the games including a picture of the Gravemind in the Halo 2 Anniversary remastered cutscenes.
You can see a full list of the achievement images by clicking here. Please note that these images are huge and 400 of them will be loaded onto one page, it may crash your browser.