How many missions are there in GTAsa?

Answer 1

There are 69 main story missions, which can be anything from brief scenes such as buying masks for a heist, up to long, multi-part missions.

The total is slightly higher because the different approaches to the heists, branch into different setup missions. The jewel store heist setup mission either has you steal carbine rifles from the LSPD, or steal a pest control van and knockout gas.

As well as these there are 58 'Strangers and Freaks' side missions, and a few other mission-like tasks such as hijacking the police car that Michael's wife is sat in after being arrested.

Answer 2

In GTA San Andreas is about 100 missions

There are 100 missions, excluding side missions e.g. paramedic