Name omitted to respect privacy but if you really want to know they're easy to find on both Lalachievements and FFXIVcollect. Here's a picture of what this insanity includes:

    Completed all five ultimate raids.

    Cleared all three Deep Dungeons solo.

    Discovered at least 20000 hoards from said Deep Dungeons.

    At least 2000 successfully completed mentor roulettes.

    At least 3000 victories in Frontline.

    At least 1000 victories in Rival Wings.

    At least 5000 victories in Crystalline Conflict or The Feast.

    Completed every levequest achievement, which due to time-gating takes a minimum of SEVEN years.

    Fully cleared all treasure dungeons at least 20 times, including the Hidden Canals of Uznair, which was a notoriously impossible achievement for many years and requires about 2000 Thief's Maps on average.

    Obtained every single relic weapon from ARR to EW.

    All extreme trials and final savage raid bosses from ARR to ShB cleared as BLU.

    Killed at least 5000 rank S marks and at least 10000 rank A marks and obtained every Hunt mount.

    All Firmament/Diadem achievements including 500,000 skyward score as every DoH/L for the Pteranodon mount.

    Obtained all ocean fishing bonuses and caught every fish.

Can confirm most of these are mind numbingly boring and mundane. I could barely get through the slog of ONE ARR and HW relic for starters. I'm also not ashamed to admit I've paid for bot programs to avoid doing a few of these tasks because of how tedious they can be. (Even just normally. I never went out of my way to try and complete any of these achievements.)