Sigh Well, after being wardeced by a Fallen Empire, and fighting them to a stalemate (which they, not I, requested) I was wardeced by the Great Kreshhk Hegemony Federation president, who was also Galactic Custodian, and his one million
plus collective fleet power. It was my tiny vassal and I versus the galactic South. Needless to say, the game ended with my (involuntarily) joining the Great Kreshhk Hegemony. I’d still say not bad, given that we started as a humble criminal syndicate. It took an ancient elder race and two thirds of the galaxy’s firepower just to annex us ☺
I did, however, receive this achievement as a recompense.

