Guitar Hero III
59 Achievements
1,000
Xbox 360
Medium Duo
Earn 5 stars on all Co-op songs for the Medium difficulty
20
How to unlock the Medium Duo achievement in Guitar Hero III - Definitive Guide
Maka91
You will need to 5-star all the co-op career songs and the 14 extra songs viewed after the setlist. You will first need to unlock them by going through career by yourself. You and your friend have to be a least familiar with the game to get this.
