Grand Theft Auto: San Andreas has a total of 100 main storyline missions
(https://i.ibb.co/7dR6z1ML/images-1.jpg)
In addition to these, there are:
Side missions (like vigilante, taxi driver, firefighter, etc.)
Asset missions
Racing events
Courier jobs
Dating and gym challenges
Collectibles and gang territories
While the main story consists of 100 missions, completing everything in the game requires significantly more. A full 100% completion involves finishing all of the above activities.
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