"Mission types" refers to the different categories or classifications of tasks or objectives that someone or an organization is aiming to accomplish. It helps identify the specific focus or purpose of their activities. Full definition
Main story missions introduce new mission types at a regular pace, so that gameplay doesn't get stale. (playstationlifestyle.net)
Even though it is set in one city, this game is HUGE and there are a large number of mission types. (buttonmashing.com)
Although it has a ton of positive points, the multitude of different mission types, crafting, tools, and techniques require a lot of instruction the game doesn't really provide. (crunchyroll.com)