It’s harder than it sounds at first glance to achieve 100 exalted reputations. Wowhead data indicates that only 2% of profiles have achieved it.
While the achievement counts reputations you earn on any of your characters, several opposing faction reputations only count once, such as Stormwind/Orgrimmar or Aldor/Scryers.
Until Patch 8.2, it was necessary to have earned Exalted with least one Classic PvP reputation in order to get to 100. After Patch 8.2, it can now be done without PvP reputations.
While I earned this last week and changed my title to Esteemed right away, nobody seems to have noticed or commented on it yet. I am a little disappointed in the Pureheart Courser mount, though, but only because it’s a ground mount and I’ve earned BfA flying.
Now that I have some additional free time that I didn’t have for the last couple of years, I plan to get back to finishing writing reputation guides, so that all of you can also get to Exalted.