I had full intentions of going all the way but damn if this game doesn't make you work for it.

I did it and had a blast while doing it, probably my favorite S-Rank. I feel so accomplished and I felt like the game actually rewarded me when hunting for these achievements, resulting in a deeper battle system post-game and way more in depth character customization in terms of weapons, accessories, and the paradigm system (experimenting with who is good for what situations and which team members work best in battle).