Mortal Shell: Enhanced Edition

For this achievement, you will need one of the two lute types in the game. The Simple Lute will likely be found first, and can only be played a certain number of times (to max familiarity) before it breaks (though it stays in your inventory which confused me as I couldn't use it anymore). The Impervious Lute will be found later or can be purchased from Vlas, and this can be used as many times as you'd like.

To unlock the achievement, have the item on your quick slot and scroll to it with the D-Pad, then press when you're near an enemy who is sitting on the ground playing a lute of their own. You can be a pretty good distance away, so long as you can hear their music. If you get too close, they'll stand up to attack and stop playing. Once you are both playing at the same time, the achievement will unlock.