Successfully complete the indicated task to unlock the corresponding Avatar Award.

Award	Task
Bass T-shirt	Get the "Bass Apprentice" achievement.
Drums T-shirt	Get the "Drums Apprentice" achievement.
Guitar T-shirt	Get the "Guitar Apprentice" achievement.
Pro Keyboard T-shirt	Get the "Pro Keys Apprentice" achievement.
Vocal T-shirt	Get the "Vocal Apprentice" achievement.