Back In The Day
Back In The Day is an achievement in Halo: The Master Chief Collection. It is unlocked by playing a Capture the Flag custom game on Blood Gulch with four players on the same console. As such, a group of players must collectively own or borrow four controllers in order to unlock the achievement. The achievement is worth 5 gamerpoints.
The achievement's description states, "Tri-tip optional." A Tri-tip is a subprimal cut of beef, and due its affordability is known to be used in children's school cafeteria lunches in parts of the United States. Thus, this is a reference to the achievement's nostalgic nature.