Campaign Complete: Legendary (Halo 3 achievement)
From Halopedia, the Halo wiki
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. So if you're friend hasn't beat Heroic yet but he helps you beat Legendary on only a few missions he will still get the Achievement.
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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