While I am sure some people like the current iteration of the achievement system, it is causing some pain points. Primarily, people are camping quest NPCs in Booty Bay in order to get a title 24/7. Because achievements are per character, for no good reason, there are some that think they need to do this on ALL of their characters. A couple easy fixes to relieve some of the pressure would be: 1. make achievements per account to exceptionally reduce the volume of characters grinding for this or 2. make quest NPC either immune or not give any rep (hurting the rep grind would be even better so they wouldn’t troll it).
I think fixing this issue while Classic has the largest influx of new and returning players would improve the leveling experience for many.