Refuge is an Achievement for Halo 3 and Halo: The Master Chief Collection.
It is obtained when one finishes the campaign mission The Ark on the Normal, Heroic, or Legendary difficulty. In Halo: The Master Chief Collection, it is possible to get this achievement on Easy.
The Halo 3 achievement gives 30 Gamerpoints to the player and is represented by a blue plate with a Roman numeral VI on it. It also unlocks the EVA shoulder piece armor permutation.
Note: You must complete the level completely through from Mission Start.