In the official forum of Samsara Online 7 classes are specified: mage, warrior, assassin, archer, priest, shield guardian and summoner.
These 7 classes are considered normal occupations. Most players of Samsara Online will have one of these 7 classes as their job.
However Evangelina Mikhalova, the creator of Samsara Online, seems to have a certain level of power in the real world. No one knows anything about her except a photograph in which you see a woman in her 30's looking normal and nothing to highlight.
Still, Eva, as people call her, didn't end up with just 7 normal-looking classes. Aside from the normal occupations, there are two other categories.
Hidden occupations and unique occupations.
Hidden occupations are extremely difficult to obtain, as they can only be acquired after a player successfully completes a difficult mission or a player with a challenging luck to heaven. But they are occupations that more than one player can have.