Campaign Complete: Legendary is a Halo 3 Campaign Achievement. It is earned when the player completes the Halo 3 Campaign on Legendary difficulty. This Achievement gives 125 Gamerpoints to the player and unlocks the Campaign Complete: Normal and Campaign Complete: Heroic achievements if not yet earned.
It is represented by a shield with two crossed Combat Knives. On top of this is a cracked Elite skull, which forms the Legendary difficulty symbol.
The achievement is still awarded when playing Co-op online and offline. If another player hasn't completed Heroic yet but helps complete Legendary on only a few missions they will still get the Achievement.
It is also recommended that when playing on Legendary you play on Co-op. Playing is a lot easier with many players (and it's funnier too).
This Achievement unlocks the EOD Spartan Armor Helmet (The shoulders and chest plate are unlocked by completing specific levels on legendary, as opposed to the entire campaign).
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