Currently there are at least 3 mutually exclusive achievements in the list (Leaving Limsa Lominsa/Gone From Gridania/Out of Ul'Dah), meaning only one of the three can ever be achieved on any one character.

As an achievement hunter (and I know there are others out there) it ruins a lot of the fun when I know I cannot completely check off a list. I am concerned that because of the already existing mutually exclusive achievements, that in the future there will also be achievements that are unobtainable to some players due to something missed or old content.

CONT BELOW