Wildland MillionaireG 15

You’ll earn 100k credits pretty easily by completing missions, opening crates containing credits, and taking them off of fallen enemies. No need to go too much out of your way, you’ll get enough credits eventually so long as you put the time in.

I recommend spending at least some of those points on vehicles. It’s nice to have some options available at bivouacs, like an attack helicopter, armored car, dirtbike, etc.