Sol SurvivorG 30

I suggest going for this at the end of any mission in the campaign. You might already be half way through, so it will take much less time.

If your colony is stable, set the speed to 8x and let the game run while you do other things. Just keep an eye out for morale... if it gets too low and there's a referendum, you might actually lose and have to do it again. That's why I suggest doing it in a mission with the Unity artifact (especially Tenari Glacier) - activating it will give the morale a significan boost, if it's necessary.

To make the colony stable, enable some policies (auto repair drones, free gaming etc.), make sure you have enough power, drone coverage, turret coverage... lower immigration rate (you don't need more people).

Since you have a lot of time on your hands, you can work towards other achievements (like uncovering the fog on the expedition map), manufacturing candy etc.