Holdout (achievement)
From Halopedia, the Halo wiki
Holdout
Holdout is a Campaign 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 20 Gamerpoints to the player.
It is represented by a blue plate with a roman numeral II on it.
Note: The player must finish the level completely through from Mission Start, or the achievement won't be unlocked.
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