Has there ever been a quest for only " first person to find it "?

Gameplay Quests
1

Just curious in the history of WOW has there ever been a quest that only 1 player per server could get? Anything like that?

2

Can’t think of any quests like that, unless there was something attached to the opening of the gates of Ahn’Qiraj.

There used to be achievements for the 1st person to max each profession in an expansion. That’s the only 1/server thing I can think of.

3

Stranglethorn Fishing Extravaganza is probably the closest thing. It’s a sunday 2pm Pacific Time fishing event that runs until the first 50 players per Region win, not per server/realm, but across all America’s servers. Its extremely competitive and difficult to win and you need a lot of extra things to help you.

4

There used to be feats of strength for people who got realm firsts in particular categories. ISTRC they stopped in Cata.

This page has some WoD realm first feats,
https://wowwiki.fandom.com/wiki/Feats_of_Strength_achievements/Realm_First!