Replay campaign mission for more credits

[ZerosLune]

I destroyed the Monolith in Mission 4 before it was even revealed as an objective. It automatically finished mission bypassing all other main and seconday objectives. So now I'm Mission 5 with no bonus credits. Reloading a checkpoint in Mission 4, finishing all objectives and then finishing the mission doesn't work. It still puts me in Mission 5 with the same credits I had before.

Is there any way to replay a campaign mission to finish all the side quests and get more credits for the next mission? Or does somebody know where to find the steam save game so I can try to edit the file or something?