Haven't played in a while, but I've been rocking "Combat Medic" on my Warrior casually since I unlocked it. It was one of the first titles I unlocked, and definitely the first that I actively tried to get. I remember a forest in one of the early human zones with a bunch of downed soldiers and a heart quest that involved reviving them. I dropped a battle standard on a group of them every time I passed by to get progress towards the achievement.

God walking amongst mere mortals

Is the only one I use

I went with the Super Adventure Box title for a long time, "Honors in Applied Jumping" I think it was. Kept that one because of how much fun I had with SAB. Eventually switched to "The Extra Life" with the hope that it might encourage others to donate, and I've been using that since.

Though I think there was one from season 3 that I used for a short while too that was a bit difficult or time consuming to get, can't quite remember it though.

I wear Gwamm on my main but I have a glowy Sylvari with radiant pieces who has "Super Shiny".

I used to play Mesmer and someone told me that your clones don't get your title, so I stopped using titles. Not sure if that's even true. But now I'd get decision paralysis if I tried to pick one!

But if I did pick, I think some came from guild wars 1 achievements and the hall of monuments. I liked those ones

I have 'Master Crafter' and have had for as long as I can remember. My main character has 4 crafts (Leather worker, Huntsman, Artificer and Jewellery), all maxed and I have the other crafts all maxed on Alts. :)

I really like the Dark Wanderer Traveler, it's cool. I don't even know what it was for anymore, something about the dark labirynth in Silverwastes.

My Necro main is in full VoE mode right now, so I'm using Eternal Alchemist as a Male Asura Ritualist, while dressed in the Ritualist outfit.

Before that, I used "Master of the Rifts" since it's apparently the rarest title I have, despite being relatively easy to get (just time consuming).

I use Kingslayer on one of my alts since I enjoyed the challenge of getting it as a glass-cannon DPS without exploiting or cheesing it.

Dark Traveller on another character since it's a reasonably cool title.

I picked the rarest that I have unlocked: Exhalted Legend