Stil there lacks some kind of endgame and thats the reason why steam achievments were added i guess.
However in my opinion one can reach these "milestones" pretty fast and i would like to have some more advanced "hardcore" achievments that force you to build a epic factory and deal with tons of logistic problems

I know that you can set yourself goals, but for uncreative players like me steam achievments " feel better"
It shouldnt be difficult to add some harder achievments, like an high energy production (maybe crazy atom reactors?) or some high value item production goals.
I would also love a given map (some harder design) with given settings on which you are supposed to fullfill some goals (more work required^^)
Is there already something like that planned and if not is this the right way to get the devs attention? didnt see a suggestion area in the forum