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