Here is the easiest way to fix the Dominion trophy/achievement...
PS4: You must rebuild the database which in in the safe mode menu. Once you rebuilt the database play one game and it will pop for you. Also try and win even though I think it still pops if you lose
Xbox One: Clear your cache. Once done do the same thing by playing one game and it should pop.
Hope this helps you fix the bugged trophy or achievement!!!
I hope that does work for some and in theory sounds like it should. When I tried that... it didn't work. What is very curious to me is we were in a party of 6 and 4 of us had the achievement pop after the same game.
I just got this game on Saturday and I just noticed this achievement, it's shocking that this game has been out for a month and this hasn't been fixed.
So three months later and they release a DLC. Yet they still cant be bothered to fix there own bugs.
Have you been playing? I think the achievement/trophy has popped for most players that have updated and won a game.
May 10th, 2017 and it is still glitched, on Xbox at least... I've won over 20 matches now, started the multiplayer on the 8th, and it hasn't unlocked for me yet. I've deleted my cache, deleted and redownloaded my profile, uninstalled/reinstalled the game with no luck.
I haven't paid much attention to the updates over the months, so I don't know if this has been directly addressed. I haven't heard many complaints lately, meaning it has popped for them, or they gave up.
My only advice would be to continue to play. Try different modes and playlists and keep winning. Mine and a few friends all popped after the same match. We were around 40-50 wins. Although I don't think it had to do with the number of wins... but instead the server we were connected to.