I've finally gotten everything else in the latest update (1.9.1), but I cannot figure out how to trigger that last hidden achievement. I'm getting sick and tired of wandering around, trying everything, and knowing nothing.
Seriously, give us a bit of a hint. I hate these completely blind activities.
And for god's sake, stop setting so many events to happen at noon! The amount of grinding needed to do everything is so frustrating. Give us some more activity in the evenings, when things are quiet. A second club activity period 2-3 times a week would be nice, for example, or random encounters in various locations.
And it really bummed me when I had to play over the weekend to initiate the final date with Lumin, only to have to wait yet another five days to get to get to the next weekend to actually do it.
And it was such a letdown when I did. So much emotional build-up, just for a short bit of auto-nookie.