Jojoya has a comment you haven't replied to. By all means. c:
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There are multiple ways that you can show off multiple titles, like swapping your title to Alpha Wolf when you're doing PvP, or put one title on your character and another on your adventurer plate. It also doesn't have to be overwritten once you get a new one. I understand having multiple that you like, but things that mattered to your yesterday don't have to become meaningless because you got something today.
IMO half of the problem is not the achievement system itself, but how those achievements can be showcased.
There are always going to be newer and cooler things. One thing always replaces the next.
But having a showcase attached to the adventurer plates would alleviate a lot of the problems. e.g., showcase your top 5 or even top 3 achievements, mounts and minions.
EDIT:
Also having an "Attach achievement progress to quest log" would probably be a great idea, so that it displays in your quest log, rather than accessing through the achievement hud window.
actually, yeah, being able to keep track of a given achievement (like the hunt ones) without having to constantly pull up the menu...which takes a few seconds to load...would be pretty nifty. hell if a meter is too hard, even having it put a message in the chatbox like it does with the Atma stuff ([x]/3 record of [enemy name] kill for Stardust Zeta Rod for example) would be useful.