IIRC, the only required part of GTAV was a single introductory mission representing a flashback of two of the main characters pulling off what was seemingly the

IIRC, the only required part of GTAV was a single introductory mission representing a flashback of two of the main characters pulling off what was seemingly their last heist. Took like 10 minutes to finish. After that, free reign of the city. There are also some non-violent missions you can accept, like filling in as driver for your friend's tow-truck service and repossessing cars. They're actually pretty fun.