@zombiepie: Nope, no S-Rank for me. I dunno if I told you that or what, but if I did I might've gotten confused with XIII-2 (which I did indeed S-Rank).
What I did do is complete all the Cie'th Stone missions. Just apparently not to the extent of getting 5-stars for all of them. I'm also missing both the 100% achievements (Crystarium and equipment) and the one where you hunt an adamantoise (though I did kill the one in FFXV, albeit through trickery).