To get achievements in Stellaris, you have to play on Iron Man. This means you can't manually save or load.
I have never played on Iron Man, primarily for one reason: frontier outposts.
There doesn't appear to be a way to determine what the effect on your borders will be prior to actually adding or removing the outpost. So, when removing an outpost, I always save first, remove it, check the results, and often load because a system I needed was lost. When adding, I have to just suck it up and guess, because building one takes a while and I wouldn't want to re-do the intervening months. I suppose I could save, schedule one, put it on fastest and not even really play, check the results, then load and build or not build for real.
So, is there any way to determine the effect on your empire's border prior to building or disbanding a frontier outpost that would work on Iron Man mode?
Best Answer
Unfortunately, there is no way at the moment other than, as you said, trial and error.