Double Double

Double Double is an achievement from Halo 3. To be awarded, 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 Gamerscore.

Trivia

 * This could be a reference to the 'Double-Double', a coffee from Tim Hortons with two cream and two sugar.