Full list of all 50 Guitar Hero II achievements worth 1,000 gamerscore. It takes around 50-60 hours to unlock all of the achievements on Xbox 360.
Got 400,000 points in a song
Got 500,000 points in a song
Got a 1000 note streak
Got 800,000 points on a song in Cooperative
Got 1,000,000 points on a song in Cooperative
Earned five stars on all songs in the Expert tour
Earned five stars on all songs in the Hard tour
Beat Jordan on Expert
Unlocked Rat Cellar
Got a 100 note streak
Completed all tutorials
Unlocked Blackout Bar
Unlocked RedOctane Club
Unlocked Rock City Theater
Unlocked Vans Warped Tour
Unlocked Harmonix Arena
Got 100,000 points in a song
Unlocked Stonehenge
Beat the Easy tour
Got 100% notes hit on a song
Failed a song on Easy
Spent $10,000 at the store
Got 200,000 points in a song
Beat the Medium tour
Earned five stars on all songs in the Easy tour
Got an 8x multiplier
Refused to play an encore
Practiced three different songs
Bought all characters
Viewed the credits
Got a 500 note streak
Earned five stars on all songs in the Medium tour
Beat a song with lefty flip on
Got a 100 note streak in Cooperative
Got a 500 note streak in Cooperative
Got a 1000 note streak in Cooperative
Got an 8x streak in Cooperative
Got 100% notes hit on a song in Cooperative
Got 200,000 points on a song in Cooperative
Beat Trogdor and Thunder Horse
Bought all songs
Beat all the unlock songs
Got 400,000 points on a song in Cooperative
Got 600,000 points on a song in Cooperative
Beat the Expert tour
Bought all guitar finishes
Bought all guitars
Beat the Hard tour
Bought all outfits
Got 300,000 points in a song