Finally got around to making a review (a SeriesView) on all the games from RR Research Society!
Coupled with Translated Visual Assets where needed (so that you can actually use their UI in some of their games), Full Saves, and Info files on the mechanics of each game, this should help lots with playing whichever of the games from this Circle you love! (I personally recommend the 15th, 12th and 8th ones at the very least).
Link to my blog post
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So question wtf is ??? I have got 30 achievements beat all substory have no still encountered ???
"???" is a new enemy unique to Substory, at the very last encounter in the Substory, after beating all the others. After beating them, you get the very last Substory level which is the same enemy but empowered.
For that achievement, you simply need to beat their normal Substory level as fast as possible (should be easily doable, at worst you equip the achievement from it and beat it again faster for the max version of the same achievement).