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