Wow, thanks for your hard work, it must have taken you ages to do all this.

As someone who did all the quests as they came out, it never occurred to me that there was so much to do when you got to 50 these days.

When it first came out King Moogle extreme and Leviathan extreme required you to complete the extreme versions of Grauda, Titan and Ifrit, but because of the difficulty of Titan extreme this requirement was removed. Typically this was done just after I finally killed Titan extreme.

I still feel the most important quest to do when you get to 50 is The Weaponsmith of Legend. Getting your relic weapon for your class is the best upgrade for you at that point, it's a fun quest, will take you through the easier level 50 dungeons and Ifrit, Grauda and Titan hard modes and unlock Chimera and Hydra, both required for the trials roulette.