Halo: Reach Cheats & Codes , unblockables , achievements

Unlockable: Halo: Reach Avatar Hoodie

Anyone who logs in and plays at least one full game of any type in the Halo: Reach Multiplayer Beta will receive a Halo: Reach Avatar hoodie via the Halo Waypoint portal on Xbox LIVE. Players must access Halo Waypoint and browse their "Halo" Career statistics after completing a match.

Multiplayer Nameplates

Nameplates are image bars that behind your name in matchmaking.
Perform the following actions to unlock Multiplayer Nameplates. You can activate the Nameplates on Bungie.net by entering yout Account Settings, and then navigating to your Game Settings. Choose Nameplates and you'll be able to activate one so that it appears in the game.

Assault Rifle - Unlocked for playing the Halo Reach Beta (closed in May, 2010)
DMR - Subscribe to Bungie Pro hosting service
HALO - Unlock the Halo, Halo 2 and Halo 3 nameplates
Halo 2 logo - Unlocked for playing Halo 2 on Xbox Live (closed April 15, 2010)
Halo 3 logo - Play the Halo 3 Campaign while connected to Xbox Live
Marathon Durandal logo - Log in at Bungie.net with Marathon Durandal on your recently played games list
MJOLNIR Mk VI (Master Chief) helmet - Unlock any 4 of the Halo (PC), Halo 2, Halo 3, Halo 3: ODST or Halo Reach Beta nameplates
ODST logo - Play the Halo 3:ODST Campaign while connected to Xbox Live
Halo: CE logo - Register your Halo (PC) product code at Bungie.net
7th Column symbol/Septagon - Log in to Bungie.net with your Gamertag/email address

Avatar Awards Unblockable

Complete the following requirements to unlock items for your Xbox Live Avatar.

Carter's Helmet - Clear a Campaign mission on Legendary without dying (Note: To get this easily, play through an entire level on Legendary and die as much as you want. At the end of the level, savea nd quit. Choose "Resume Campaign" and then finish the level without dying to get the Avatar.)
Emile's Helmet - Earn a Bulltrue medal in either multiplayer or Firefight Matchmaking (Kill someone while they're lunging with an Energy Sword attack)
Jorge's Helmet - Earn a Killtacular in multiplayer Matchmaking (Kill 5 enemies within 4 seconds of eachother)
Jun's Helmet - Kill 100 enemies in a row without dying in either the Campaign or Firefight (set your shields/life to infinite in a Firefight match)
Kat's Helmet - Avenge a teammate's death in multiplayer Matchmaking (Kill someone who killed your teammate)