The Key
From Halopedia, the Halo wiki
The Key
The Key is an Achievement for Halo 3 on the Xbox 360.
It is earned when one finishes the campaign mission Template:Levelname on the Normal, Heroic, or Legendary difficulties, and gives 40 Gamerpoints to the player.
It is represented by a blue plate with a roman numeral VIII on it.
Note: You must finish the level completely through, or the achievement will not unlock.
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