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