Killing Za'Dha Adamantking (present version) ranked me up from 7 to 8. I had already killed the Orc/Yagudo present kings, so I assume all three were needed.
Other relevant information:
-All Jobs 99, 9/22 Mastered
-All Combat, Magic, and Craft skills capped + Alchemy Escutcheon, Ebisu/Lu Shang's +1
-932/1066 total Titles (if I counted right)
-4/4 Master Trials cleared
-16/16 Aeonics, 1 Relic, 5 Mythics, 1 Empyrean, and Idris
-All missions complete up to latest Voracious Resurgence missions
-All quests completed except: 10k Carp, Fit for a Prince, Donate to Recycling, Five Seconds of Fame, and The Fighting Fourth (Epeolatry's initial quest completed, but nothing further)
-All NM titles (including all VD BC titles and Judge, Jury, and Executioner) except Sandworm, Lambton Worm, and Chest/Coffer O' Plenty
-All Conquest point titles
-Abyssea 100% complete
-Voidwatch 100% complete AND all Atmacite fully upgraded
-All trusts, including Monberaux and Ygnas
-Level 143 Incursion KI
-1075 RoEs complete (everything possible with Alchemy Escutcheon)
-All Vorseals except Chocobo Racing, 8/8 Regen, 9/9 Refresh, 9/9 Acc++
-All fish caught except Bibiki Urchin
-Maze Scholar title from MMM
-Monstrosity: Highest level 90 (Toad), nothing done with PvP
-Nothing done with Chocobo Racing
-Most Campaign Ops not done (Fiat Lux, Plucking Wings, Splitting Heirs completed)
-Mog Garden: 1.9k entrances, 620 furrows, 950 grove, 925 veins, 120 pond/coast, 1.1k monster cares, 40 creatures raised