Not playing on Paradise here so can only base myself on Insomnia and experience from where I played in past...
1. Something to check: there is a title in dust devil canyon (the camp with the blackie quest) where you get some membership title if you are female. Someone could check if you can get it after changing gender or not.
> This title "Ecology Research Team Member" should be available for all genders and races afaik. You just have to choose the right chat option at npc once you get there 1st time.
2. Dwarf titles are unobtainable to other races (even if you change race to dwarf)
> correct not obtainable for non dwarf.
3. EOJ Event in Redhill Mountains that gives the last zone title
> have heard rumors it is obtainable / was obtainable once, but the event seems to be broken ever since it came out and will take a long time to complete (you will spend a couple of hours there and you can't fail).
4. Perfect tile combinations from Aeternal Circle
> should be obtainable but purely luck based to get all correct.
5. Rune Splinter title, obtain 30,000 at once (something like this, this title is possible, will leave to playerbase discussion for now)
> should be obtainable but purely luck based.
6. 20 flowergod messengers - festival title (highly annoying but obtainable, if it doesn't break and the npcs don't spawn, player discussion)
> obtainable but means effort and cooperating npc's as mentioned. This same applies for all festival events that needs searching npc's as well as other players to help out.
Titles like nemesis of the undead (fa), and the one from MA are obtainable but have level requirements, once passed with 1 of your classes you cannot do no more.