Can AI win in any way other than dominance?
Solution 1:
I can confirm a very good effort for a science win from AI. They have built an Apollo Program and several ship parts. It was a really nice end-game race, as I was beelining tech tree to rush United Nations for diplomatic. It was my first successful immortal game so I didn't want to lose it just to see if AI can win, but it certainly looked like they could.
On the other hand I had another game where I was hopelessly lagging behind a runaway AI on science. They entered future era, when I was still in mid-industrial. But they were so busy conquering the world that didn't bother to go for science victory. So it might be that if AI is set up to achieve dominance they won't go for other types if victory.