I wanted to share an exciting Kickstarter project I've embarked upon that has the potential to help you with some of these guitar-controller specific achievements.
You can see all the details of the project at this link, but in short I have put a small circuit in-line with a guitar controller (between the frets/strum and the processor) to mimic button presses. Combine that with some software files that are synced to song files and BLAM. 100% FC'd songs.
I'll be happy to answer any questions here you may have.