Aven Colony

This can be easily completed once you have conquered the Sol Survivor achievement (survive for 50 sols in any mission). This is easiest on the first level. If you did this achievement on Cakewalk you should have a massive amount of nanites stored once you're done fast-forwarding through the years. Save you game. Now pause and build as many farms as you need. Fast forward and then reload. Now is a good time to build 200 solar panels for Solar Tycoon. Pause (crucial to the strategy). Build as many as you can be bothered/can afford to. Save your game. Fast forward while they are built. Then reload and you can watch your robots build them again. Rinse and repeat till insane. You can also recycle 100 structures at this point (just don't recycle the construction bots or power!) and then go back to an earlier save. You can also activate 10 policies for Kid in an Elevator. And if you have enough nanites you could try to build three mega-structures if you don't have Megalopolis! In fact I could go on and on but once you've reached this golden point you can rinse and reload to get a vast amount of achievements if you don't have them.