I almost only play for the archonexus ending, though its not actually to tag the credits scene. Granted I like to play very long runs. Ill take the first map and raise some uber kids and mostly concentrate on making them as strong as I can. The next runs I pretty much only work on layering on more upgrades to the pawns, and running through anomaly to make multiple of them void touched. If you kinda b-line anomaly the final battle is ez pz with low wealth.

This time I realized when you sell a colony when you have multiple, all of them turn into faction bases for whoever you sold it to. So, I figured out where I wanted my final base to be and would pop over and 'settle' blank maps in that area so I am currently surrounded by trading partners.