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