I got there on my own, it was a no spoilers run even though I'd played all the way through chapter 4 in the beta. I did save and reload a lot to see different outcomes of stuff that wasn't in the beta so there was a little trial an error but I didn't know that was a possible outcome until I got it.
I'm kind of a completionist in games though not an achievement hunter. Skipping Nenio's quest hurt me almost as bad as trying to do it.