In Starcraft II, how come I "beat the game" but it says only 22 or 26 missions completed? Wheres the other 4?

each time you have to choose to side with one group or the other (for isntance when you have to pick to help Nova or the spercter guy) you are picking which mission you will do, so 3 of the missing 4 are the missions where you chose the other option, the 4th mission missing is a "secret mission" you get for destroying the science facility hidden in mission "media blitz"