On Xbox.com there is new news of how you will be able to earn those achievement points you will want to get. It looks like it will be a little harder than some games as there will be achievments based on which faction you enter into and whatnot.
Much of the side-stories and quests found in the world of Tamriel stem from the various factions youâ€™ll find throughout the land. Within each faction (e.g. the Thieves Guild) are different ranks. Youâ€™ll unlock an achievement for each rank you find yourself promoted to. Not only does this offer much in the way of variety, but youâ€™ll find you wonâ€™t be able to join each faction in one play-through. Therefore, youâ€™ll not only find different achievements when you play through as different characters, but also entirely different chains of quests and storylines.