Ok, well I know that these few points dont matter to more than the few people who need 25 GP but im helpin all fellow gamers anyway
Go to the Cheats Menu, Type in the Unlock All cheat, go back to the options menu, go to store, select your band, voila
You will now get the All Songs, Guitars, and People Achievements (15 GP all together) along with the Achievement for getting all three things.
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