This achievement is unlocked when you complete all the tutorials on Band Hero.
When you're on the main menu scroll up to 'Training' and from there select 'Tutorials'. You will now find a couple of options to choose from such as, Band Tutorial, Basic Tutorial, Guitar Tutorial and Drum Tutorial.
The first thing to do is the Basic and Band tutorials, simply start each one up and keep skipping by pressing the green button on your controller until they're finished.
Next start up either the Vocal, Drum, Guitar or Bass tutorials, remember you can do exactly the same by skipping each section however sometimes you will be asked to hit a section of notes - Don't worry, you don't need to hit any of them for the achievement to work if you're worried.
Remember, there are usually a Basic, Intermediate and Advanced tutorial for each instrument, so be aware that you're completing all of them. (You can check by going on the tutorial menu and making sure all the boxes are ticked when going into each instrument)
One final note, you don't need the official Guitar Hero Drums for this, you can use the Rock Band drums too. Those worrying about the accents and double bass training - It's fine, it will let you do the tutorials as long as you do them one after another by pressing 'continue'.
The same goes for the Guitar Controller, you don't need the slider bar to do each tutorial, just simple press 'continue' after each tutorial and you should get through.
Happy achievement hunting!