Pillar of Autumn
Pillar of Autumn is an achievement in Halo: Combat Evolved Anniversary and Halo: The Master Chief Collection. It is awarded for completing the level The Pillar of Autumn on any difficulty. The achievement is worth 25 Gamerpoints in Combat Evolved Anniversary and 10 Gamerpoints in The Master Chief Collection.
In the original Halo: CE Anniversary it is represented by the Roman numeral of "I" over a darkened version of Anniversary's logo. In The Master Chief Collection it is represented by a screenshot of a corridor on the UNSC Pillar of Autumn.