1. Easy Avatar Carter's Helmet unlock

   Normally, you'd have to complete a level on Legendary without dying to get this. However, you can play up until just before the end and "Save and Quit" on a checkpoint. Then, Resume the game and finish the level (without dying for those last few parts). After you finish, you should get the Avatar Unlock pop-up.

2. Easter Egg: Change Club Errera's Music and Brute Dance Party

   In Mission 7, you can change the music to the tracks "Never Surrender" and "Siege of Madrigal" in Club Errera. During Mission 7, once you get to the Club Errera part of the mission, head back to the hospital. Fly to a ledge below the usual entrance. If you chose the right one, when you get out you should see a green light. Once found, activate it and go back to Club Errera. Land and when you walk in the song "Never Surrender" will be playing. If you want to change the music again, go back to your Falcon and fly to the roof of Club Errera. Guess what, there's another switch. Activate it and the song "Siege of Madrigal" will now be playing. If you return to the dance club after you clear it out (Hunters included) then a Brute DJ will be spinning records, a Brute tends the bar and Grunts get freaky.

3. Master Chief Cameo

   Upon completing the final level (The Pillar of Autumn), you will see a cut-scene of the ship taking off. When the cut-scene starts, hold your aiming stick (it will be dependent on your control scheme) so that you would "turn right" normally. At the point when the UNSC shuttle docks at the Pillar of Autumn's landing bay, the camera will move to the right (if you were holding the stick to aim right) and catch a shot of a Spartan in a capsule. Should look familiar, right?

4. Achievements

   Achievement	Achievement
   Completed every mission in Halo: Reach alone, on Legendary.	A Monument To All Your Sins
   Completed all of the Daily Challenges in a given day.	A New Challenger
   Killed 10 enemies in Firefight or Campaign with a supercombine explosion.	A Spoonful Of Blamite
   Used the File Browser to upload a file to your File Share.	A Storage Solution
   Killed 10 enemies in a Firefight or Campaign session with the DMR.	An Elegant Weapon
   Reached the rank of Captain in the UNSC.	An Honor Serving
   Hijacked a Banshee during the Reach Campaign.	Banshees, Fast And Low
   Let a teammate spawn on you 5 times in an Invasion Matchmaking game.	Be My Wingman Anytime
   Scored 200,000 points in a Firefight game.	Blaze Of Glory
   Recommended a file to someone.	Cool File, Bro
   Earned a Killionaire medal in Firefight.	Crowd Control
   Used a Health Pack to replenish life after taking body damage.	Doctor, Doctor
   Completed the 8th mission on Normal or harder.	Dust And Echoes
   Scored 50,000 points in a Firefight game.	Firestarter
   Completed the Campaign on Heroic difficulty.	Folks Need Heroes...
   Completed a Firefight set on Legendary without dying.	Game, Set, Match
   Completed the Campaign on Legendary difficulty.	Gods Must Be Strong
   Scored 1,000,000 points in a Firefight game.	Heat In The Pipe
   Killed 3 of the anti-aircraft batteries during the 8th mission.	I Didn't Train To Be A Pilot
   Completed the 4th mission on Normal or harder.	I Need A Weapon
   Killed 10 enemies in a Firefight or Campaign session with the M6G pistol.	I See You Favour A .45
   Performed an Assassination against an Elite to survive a fall that would've been fatal.	If They Came To Hear Me Beg
   Completed the 7th mission on Normal or harder.	Into The Howling Dark
   Killed 7 Moa during the 2nd mission of the Campaign.	KEEP IT CLEAN
   As an Elite, killed 5 Spartan players in Matchmaking.	Knife To A Gun Fight
   Advanced a Commendation to a Silver state.	Lemme Upgrade Ya
   Earned a Triple Kill while Jetpacking in Campaign, Firefight or Matchmaking.	Lucky Me
   Purchased an item from the Armory.	Make It Drizzle
   Purchased an item from the Armory that required the rank of Lt. Colonel.	Make It Rain
   Completed a Weekly Challenge.	One Down, 51 To Go
   Completed the 3rd mission on Normal or harder.	Protocol Dictates Action
   Scored 15,000 points in Score Attack Firefight Matchmaking.	Score Attack
   Completed the 10th mission on Normal or harder.	Send Me Out... With A Bang
   Won a game of Invasion in the 1st phase.	Skunked
   Traded weapons with an AI ally in Campaign.	Swap Meet
   Finished the 9th mission on Legendary with the Scorpion intact.	Tank Beats Everything
   Performed an Assassination on an enemy.	That's A Knife
   Completed the Campaign on Normal difficulty.	The Soldier We Need You To Be
   Reached the rank of Corporal in the UNSC.	The Start Of Something
   Cleared the 2nd mission without setting foot in a drivable vehicle.	They've Always Been Faster
   Completed the 9th mission on Normal or harder.	This Is Not Your Grave
   Completed the 5th mission on Normal or harder.	To War
   Killed 2 vehicles at once with the Target Locator in the 3rd mission.	Two Corpses In One Grave
   Destroyed the Corvette's engines & escort in under 3 minutes in the 6th mission on Heroic or harder.	Wake Up Buttercup
   Completed the 2nd mission on Normal or harder.	We're Just Getting Started
   Earned a Killing Spree in multiplayer Matchmaking.	What's A Killing Spree?
   Earned a First Strike Medal in a Matchmaking game.	Yes, Sensei
   Completed the 6th mission on Normal or harder.	You Flew Pretty Good
   Killed the Elite Zealot before he escaped during the 5th mission.	Your Heresy Will Stay Your Feet

5. Multiplayer Nameplates

   All nameplates are activated under Account>Game Settings>Nameplates on Bungie.net.

   Unlockable	Unlockable
   Have played the Halo Reach Beta in May 2010	Assault Rifle
   Activate blue flames through iPhone/iPod app to unlock	Bungie Nameplate
   Subscribe to the Bungie Pro hosting service	Designated Marksman Rifle (DMR)
   Unlock the Halo, Halo 2 and Halo 3 nameplates	HALO
   Have played Halo 2 on Xbox Live before April 15, 2010	Halo 2 logo
   Play any Campaign level in Halo 3 while connected to Xbox Live	Halo 3 logo
   Have Marathon Durandal in your recently played games list and login at Bungie.net	Marathon Durandal symbol
   Unlock any 4 of the Halo PC, Halo 2, Halo 3, Halo 3: ODST or Halo Reach Beta nameplates	MJOLNIR Mk VI helmet logo
   Play Halo 3:ODST while connected to Xbox Live	ODST logo
   Register your Halo PC product code at Bungie.net	Original Halo logo
   Activate through Bungie Mobile iPhone/iPod app	Star Nameplate
   Join Bungie.net and login with your Gamertag's email address	The Septagon (7th Column symbol)

6. Noble Map Pack DLC Achievements

   Achievement	Achievement
   Noble 1: Earn a Double Kill with the shotgun in multiplayer Matchmaking.	Both Barrels
   Noble 1: Kill a player at long range with the DMR in a matchmade Slayer game.	Cross-Mappin'
   Noble 1: Earn a kill in a matchmade Rocket Race game.	Offensive Driver
   Noble 1: Destroy a vehicle using Armor Lock in a matchmade game.	Poppin' & Lockin'
   Noble 1: Earn a Double Kill from the Grave in multiplayer Matchmaking.	Totally Worth It
   Noble 1: Collect all of the flags in a matchmade Stockpile game.	You Ate All the Chips
   Noble 1: Blow up the research facility in a matchmade Invasion game on Breakpoint.	You Blew It Up!

7. Avatar Awards

   These awards can be used with your Avatar after meeting the requirements.

   Unlockable	Unlockable
   Clear a Campaign mission on Legendary without dying.	Carter's Helmet
   Earned a Bulltrue medal in either multiplayer or Firefight Matchmaking.	Emile's Helmet
   Earn a Killtacular in multiplayer Matchmaking.	Jorge's Helmet
   Kill 100 enemies in a row without dying in either the Campaign or Firefight.	Jun's Helmet
   Avenged a teammate's death in multiplayer Matchmaking	Kat's Helmet

8. How to lower your gun.

   Get in a local game.

   Effect	Effect
   Press/hold down on the d-pad, RS, reload and switch grenade.	Lowers your gun.

Walkthroughs & FAQs