Guitar Hero: Metallica Cheats for the Xbox360

Cheat Code

First You have to select "Cheats" at the main menu, then "Enter New Cheat" and press the following buttons to unlock the corresponding cheat option at the menu. A message will confirm correct code entry.
Press [Yellow]x2, [Blue], [Red], [Blue], [Green] - Performance mode.
Press [Red]x2, [Yellow], [Red], [Blue], [Red], [Red], [Blue] - Star Color.
Press [Yellow], [Green], [Red], [Blue]x4, [Red] - This mode automatically plays the bass pedal for the drummer. It has no effect online.
Press [Red], [Green]x2, [Yellow], [Blue], [Green], [Yellow], [Green] - Vocal Fireball.
Press [Red]x2, [Blue], [Yellow], [Green]x3, [Yellow] - Air instruments.
Press [Red]x3, [Blue]x2, [Green]x2, [Yellow] - Always Drum Fill.
Press [Yellow], [Red], [Green], [Red], [Green], [Red]x2, [Blue] - Black Highway.
Press [Green], [Red], [Green], [Blue], [Red]x2, [Yellow], [Blue] - Flame Color.
Press [Blue], [Red]x2, [Green], [Red], [Green], [Red], [Yellow] - Gem Color.
Press [Green], [Red], [Yellow], [Blue]x2, [Yellow], [Red], [Green] - Metallica Costumes.
Press [Green], [Blue], [Red], [Yellow]x2, [Red], [Green]x2 - Hyperguitar, Hyperbass, and Hyperdrums.
Press [Green], [Red], [Yellow]x3, [Blue]x2, [Green] - Invisible Rocker.
Press [Green]x2, [Red]x2, [Yellow], [Red], [Yellow], [Blue] - This turns all guitar notes (not chords) into touch pad sliding notes connected by purple lines. It has no effect online.
Press [Green], [Red], [Yellow], [Blue], [Red], [Yellow], [Blue], [Green] - This unlocks additional Line 6 effects in the Music Studio.

Hints

Achievements
If You complete the indicated task You'll unlock the corresponding accomplishment.
Holier Than Thou (150) - Complete all instrument careers.
Metallica (75) - Complete any instrument career on Expert (Guitar, Bass, Vocals, Drums or Band).
...And Justice for All (50) - Earn 100 stars in Band Career or any single instrument Career.
Nothing Else Matters (50) - Complete the career in a band (2-4 player band).
The Ecstacy of Gold (50) - Earn $15,000.
Battery (30) - You scored 1,000,000 on the song Battery as a band.
Creeping Death (30) - You scored 575,000 on the song Creeping Death as the guitarist.
Dyer's Eve (30) - You scored 450,000 on the song Dyer's Eve as the drummer.
Enter Sandman (30) - You scored 330,000 on the song Enter Sandman on guitar.
Fight Fire with Fire (30) - You scored 340,000 on the song Fight Fire with Fire as the bassist.
Hero of the Day (30) - Complete a song on Expert + in Quickplay or Career (drums only).
Metal Militia (30) - 100% a song (4 player band).
Stone Cold Crazy (30) - You scored 65,000 on Stone Cold Crazy as the vocalist.
James Hetfield (25) - Complete the career as the vocalist.
Kirk Hammett (25) - Complete the career as the guitarist.
Lars Ulrich (25) - Complete the career as the drummer.
Robert Trujillo (25) - Complete the career as the bassist.
Seek & Destroy (25) - Play 20 online matches.
The Four Horsemen (20) - Complete a song with all band members on expert in Quickplay or Career (4 player band).
Wherever I May Roam (15) - Complete a song in every venue.
Green Hell (15) - Drummed every green note and finished the song Blood and Thunder with the rock meter in green.
2 X 4 (10) - Earn a band Hot Streak (4 player band).
Astronomy (10) - You hit every star power phrase in the song Orion.
Better Than You (10) - Win an online Pro Face-Off match.
Black (10) - Win an online battle match with the Fade to Black power up.
Blitzkrieg (10) - Win an online Band v Band match (8 players).
Master of Puppets (10) - You scored the highest individual score on a song in a band.
Ride the Lightning (10) - You triggered star power simultaneously (4 player band).
One (10) - Complete a song with any instrument on Hard or Expert in local Quickplay or Career.
The House Jack Built (10) - You completed a song in every In-the-Round venue.
The Struggle Within (10) - Complete a song in a band in Quickplay or Career (4 players).
The Unforgiven (10) - Win an online Face-Off match.
The Unforgiven II (10) - You won an online Face-Off match by 25,000 points or more.
The Unforgiven III (10) - You won an online Pro Face-Off match by 25,000 points or more.
Blackened (5) - You created a custom tattoo.
Cure (5) - You recovered from a poor performance in Quickplay or Career.
Damage Inc. (5) - You performed as the drummer.
Disposable Heroes (5) - You created a new custom rocker.
Eye of the Beholder (5) - You created a new custom band logo.
Fixxxer (5) - You created a new custom instrument.
Invisible Kid (5) - You performed as the bassist.
King Diamond (5) - You rocked out as King Diamond.
Lemmy (5) - You rocked out as Lemmy.
Motorbreath (5) - You performed as the vocalist.
Reload (5) - Download a song from GHTunes.
Some Kind of Monster (5) - You performed as the guitarist.
Stone Dead Forever (5) - You completed a song at The Stone venue.
The Memory Remains (5) - View a Metallifacts video.
The More I See (5) - Complete the Tutorials.
Trapped Under Ice (5) - You completed a song at the Ice Cave venue.

Unlock Characters
James Hetfield - Earn 100 stars in vocalist career mode.
James Hetfield Classic - Get 150 starts on Vocals career mode.
James Hetfield ZOMBIE - Earn 200 stars in Vocal career mode.
Robert Trujillo - Earn 100 stars in bass career mode.
Robert Trujillo Classic - Earn 150 stars in bass career mode.
Robert Trujillo ZOMBIE - Earn 200 stars in bass career mode.
Kirk Hammett - Earn 100 stars in guitar career mode.
Kirk Hammet Classic - Get 150 starts on Guitar career mode.
Kirk Hammett ZOMBIE - Earn 200 stars in Guitar career mode.
King Diamond - Beat the song "Evil" in any instrument career.
Lemmy - Beat the song "Ace of Spades" in any instrument career mode.
Lars Ulrich - Earn 100 stars in drum career mode.