Easy Way of Unlocking 'Buy a Guitar Already' Achievement
If you don't want to waste time playing through an entire Hard or Expert Career using the controller then just complete career mode normally and 'Save' the game. Turn off the console and then switch it back on with the regular controller plugged in and when you go to the career you completed and enter the 'Character Select' screen the achievement will be unlocked. This sneaky little trick can be done any time after clearing a career.
Added by: Sanzano Nov 2nd 2007, ID#1713