Double Double is an achievement from Halo 3. To be obtained, the player has to get two double kills during any ranked or social game on a Legendary or Mythic map. It was released, along with Title Update 2, on September 23, 2008. It is worth 25 Gamerpoints.
- This could be a reference to the 'Double-Double', a coffee from Tim Hortons with two cream and two sugar.
- This is the most common achievement that people have earned while playing on a Legendary or Mythic map.