Guitar Hero III

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.