Guitar Hero III
59 Achievements
1,000
Xbox 360
Rock Guru
Earn 5 stars on all songs on the Medium difficulty
20
How to unlock the Rock Guru achievement in Guitar Hero III - Definitive Guide
If you are familiar with the other games, then you should be able to get this achievement without breaking a sweat. I played Medium career through once and only went back for two songs. Some songs may become frustrating as you fail them over and over, but you have to practice them. I recommend playing them at a slower speed in practice, if you can't get the strumming right.
For Medium 5 star cut-offs, go here.