Here is the full list of all 8 Live the Guitar achievements.
Have personal best scores in all songs on insane difficulty
Have personal best scores in all songs on hard or very hard difficulty
Have personal best scores in all songs on normal difficulty
Have perfect personal best scores in all songs in The Festival level
Have personal best scores in all songs on easy or very easy difficulty
Have perfect personal best scores in all songs
Have perfect personal best scores in all songs in the Club level
Sucessfully complete the Rehearsal level and become member of The Snuff