The Key

The Key is a Campaign Achievement for Halo 3 and Halo: The Master Chief Collection.

Overview

Halo 3

The Key

Halo 3

In the original game, it is worth 40 Gamerscore and is unlocked by beating Cortana from the start of the mission on Normal, Heroic, or Legendary. In the original game it is represented by a blue plate with the Roman numeral VIII on it.

Halo: The Master Chief Collection

The Key

Halo: The Master Chief Collection

In The Master Chief Collection it is only worth 10 Gamerscore, though it can also be unlocked on any difficulty. The achievement's Xbox art is the loadscreen image for the level.

v • d • e Achievements in Halo 3 (list)

Campaign	Landfall • Holdout • The Road • Assault • Cleansing • Refuge • Last Stand • The Key • Return • Campaign Complete: Normal • Campaign Complete: Heroic • Campaign Complete: Legendary • Marathon Man

Meta-game	Guerilla • Demon • Cavalier • Askar • Exterminator • Ranger • Vanguard • Orpheus • Reclaimer

Campaign skulls	Iron • Black Eye • Tough Luck • Catch • Fog • Famine • Thunderstorm • Tilt • Mythic

Mythic Map skulls	Assembly Skull • Citadel Skull • Heretic Skull • Longshore Skull • Orbital Skull • Sandbox Skull

Multiplayer	Graduate • UNSC Spartan • Spartan Officer • Two for One • Too Close to the Sun • Triple Kill • Overkill • Lee R. Wilson Memorial • We're in for Some Chop • Killing Frenzy • Steppin' Razor • Mongoose Mowdown • Up Close and Personal • Fear the Pink Mist • Headshot Honcho • Used Car Salesman • MVP • Maybe Next Time Buddy

Legendary Map multiplayer	Look Both Ways • Road Rage • Flag Dropped • Defend This • Came... From... Behind • Alas, Poor Yorick • Double Double

Mythic Map multiplayer	Hammer Time • Blades of Fury • Ghost Patrol • Post Mortem • ... Get the Horns • Awww, Too Bad • Killtacular • Have Fun Respawning • Save This Film • Delicious Brains • Zombie Repeller • Tank Dropper • Pull!

Vidmaster Challenges	Vidmaster Challenge: Lightswitch • Vidmaster Challenge: Annual • Vidmaster Challenge: 7 on 7 • Vidmaster Challenge: Brainpan

v • d • e

Achievements in Halo: The Master Chief Collection (list)

v • d • e Halo 3

Campaign completion	Landfall • Holdout • The Road • Assault • Cleansing • Refuge • Last Stand • The Key • Return • Training Wheels • Prophet's Bane • With Your Shield or On It • Finished the Fight

Campaign scoring	Speedy One One Seven • Time Shift • Highway Robbery • Lightning Strike • Dambuster • Waypoint • Scarab Slide • Making History • Go, Chief! Gun It! • Speed Demon • Guerilla • King of the Crows • Cavalier • Askar • Exterminator • Ranger • Vanguard • Orpheus • Torchbearer • Better With Age

Collectibles	Rising Waters • Inundation • Before the Fire • Tipping Point • Unto Dust • Babbling Dead • Sword and Shield • The Coin's Fault • Whispers Across the Galaxy • No Stone Unturned • Skulltaker Halo 3: Iron • Skulltaker Halo 3: Black Eye • Skulltaker Halo 3: Tough Luck • Skulltaker Halo 3: Catch • Skulltaker Halo 3: Fog • Skulltaker Halo 3: Famine • Skulltaker Halo 3: Thunderstorm • Skulltaker Halo 3: Tilt • Skulltaker Halo 3: Mythic • Skulltaker Halo 3: Blind • Skulltaker Halo 3: Grunt Birthday Party • Skulltaker Halo 3: Cowbell • Skulltaker Halo 3: IWHBYD • Witch Doctor • Assembly Skull • Orbital Skull • Sandbox Skull • Citadel Skull • Heretic Skull • Longshore Skull • Brainpan

Easter eggs	Dirge of Madrigal • Missing Link • Primate • Haplorrhini • Can't Keep Him Down • Flipyap • Heading to his Destiny • Sounds Familiar • Milk Carton • Cool Story Bro • Man on the Moon • Hippo Hero • Elder Signs

Miscellaneous	Third Time's A Charm • Mind the Gap • Begins with a Single Step • Who Needs Them? • Phantom Hunter • Annual • A Preference for Pain • Devastating • World Traveler • Just Browsing • Boot Camp Hero • Aficiando

For a complete list, check out our Master Chief Collection achievements category.

Overview

Halo 3

Halo: The Master Chief Collection

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