The Armant setting permits a majority of 1st-party classes (including archetypes), but if you have any questions, feel free to ask. Also, if you wish to pursue a prestige class, make sure to ask, though I cannot think of any off the top of my head that are forbidden. Archetypes and prestige classes that are geared towards specific elements of another setting—like gods, nations, or races not present in Armant—can usually be cosmetically retooled for the setting.
As usual, no 3rd-party classes are permitted.
Permitted Core Classes
Permitted Unchained Classes
Permitted Base Classes
Permitted Occult Classes