Night in the Woods

On days 1, 4 and 8 you'll have unmissable band practice, where you and your friends will play a different song each time. In order to unlock this achievement, you'll need to do real bad when playing the songs in a Guitar Hero style minigame.

This is really easy, as all you have to do is simply not touch anything during the song. After that, Gregg will complain about you "not playing mostly". The three songs must be failed during the same playthrough, and has to be during band practice. Playing in Mae's room doesn't count.