Campaign Complete: Heroic (Halo 3 achievement)
From Halopedia, the Halo wiki
Campaign Complete: Heroic
Campaign Complete: Heroic is a Halo 3 Campaign Achievement. It is earned when the player completes the Halo 3 Campaign on Heroic difficulty. This Achievement gives 125 Gamerpoints to the player and unlocks the Campaign Complete: Normal achievement if not yet earned. It can be earned through either co-op, single player or a combination of the two.
It is represented by a shield with two crossed Combat Knives. This unlocks the Flight Harness elite armor.
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