How many missions are there in the game's campaign?

[ALOBANYA]

How many missions are there in the game's campaign?

[evanloohaklm]

There are 40 missions total (including optional missions), 22 are in part 1, 18 are in part 2, there are 9 optional missions, there is 4 in part 1, and there is 5 in part 2.