I finally got the extreme conditions milestones finished. This was easily the worst part of the game. Fuckin hated it. If you never die it's not too bad, but I wasn't aware of this. To get the final milestone you have to survive extreme conditions for 32 sols. I thought it would just save my progress after each milestone and I could continue from there, but for example if you're at like milestone 7 and you die then you don't lose milestone 7, but your progress goes back to 0 sols and you have to redo all that work you did to get to back to milestone 7. There's also no way to track your progress so you have no idea where you're at until you catch up to where you were. I read you can just sit in a bunker afk, so that's what I did yesterday...
Also each sol is about 14 minutes, so altogether it takes about 7 and a half hours to finish it...Don't die when you're about 5 hours into it or you have to do those 5 hours all over again.
Only 2 more milestones to go and I'll get my platinum. At least they're easy ones, just need to do a lot more warping and kill some space pirates.