1. Halo: The Master Chief Collection Achievements
  2. The Key achievement
Halo: The Master Chief Collection

Halo: The Master Chief Collection

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The Key achievement in Halo MCC

The Key

Halo 3: Complete Cortana.

The Key0
1 guideOnline/Offline - These achievements can be obtained in either an online or offline game mode.Single Player - These achievements can be obtained by a single player.Cooperative - These achievements can be obtained by two or more players in a cooperative game mode who have met the achievement requirements.Main Storyline - These achievements are gained automatically by progressing through the main game modes.
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How to unlock the The Key achievement

  • Apache117XApache117X
    13 Feb 2015 07 Feb 2018 07 Feb 2018
    20 1 0
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    This is a campaign related mission for MCC: Halo 3.

    To obtain this you must finish the mission Cortana. Mission difficulty doesn't matter.

    However, you must be carful if using skulls as some may void the achievement, these skills have a warning on them before you start the mission (anything with a 0.00 multiplier).

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