The Key

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The Key
H3 Achievement The Key.png TheKeyAchievementArt.jpeg
40/10 Gamerscore.gif

The Key is an achievement for Halo 3 and Halo: The Master Chief Collection. In the original game, it is worth 40 gamerpoints and is unlocked by beating Cortana on Normal, Heroic, or Legendary. In The Master Chief Collection it is only worth 10 gamerpoints, though it can also be unlocked on Easy.

In the original game it is represented by a blue plate with a roman numeral VIII on it. In The Master Chief Collection it is represented by a screenshot of the level.

Note: You must finish the level completely through, or the achievement will not unlock.

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Achievements in Halo 3
Source
Campaign LandfallHoldoutThe RoadAssaultCleansingRefugeLast StandThe KeyReturnCampaign Complete: NormalCampaign Complete: HeroicCampaign Complete: LegendaryMarathon Man
Meta-game GuerillaDemonCavalierAskarExterminatorRangerVanguardOrpheusReclaimer
Campaign Skulls IronBlack EyeTough LuckCatchFogFamineThunderstormTiltMythic
Mythic Map Skulls Assembly SkullCitadel SkullHeretic SkullLongshore SkullOrbital SkullSandbox Skull
Multiplayer GraduateUNSC SpartanSpartan OfficerTwo for OneToo Close to the SunTriple KillOverkillLee R. Wilson MemorialWe're in for Some ChopKilling FrenzySteppin' RazorMongoose MowdownUp Close and PersonalFear the Pink MistHeadshot HonchoUsed Car SalesmanMVPMaybe Next Time Buddy
Legendary Maps Multiplayer Look Both WaysRoad RageFlag DroppedDefend ThisCame... From... BehindAlas, Poor YorickDouble Double
Mythic Maps Multiplayer Hammer TimeBlades of FuryGhost PatrolPost Mortem... Get the HornsAwww, Too BadKilltacularHave Fun RespawningSave This FilmDelicious BrainsZombie RepellerTank DropperPull!
Vidmaster Challenges Vidmaster Challenge: LightswitchVidmaster Challenge: AnnualVidmaster Challenge: 7 on 7Vidmaster Challenge: Brainpan