The Key

The Key is an Achievement for Halo 3 and Halo: The Master Chief Collection.
It is obtained when the player finishes the campaign mission "Cortana" on 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 40 Gamerpoints to the player and is represented by a blue plate with a Roman numeral VIII on it.
==Trivia==
*It's name is a reference to Cortana having the Key to activate the new Halo.
==Gallery==
HTMCC AchievementArt TheKey.png|The Achievement art
Category:Halo 3 Achievements
Category:Halo: The Master Chief Collection Achievements