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