There are several threads about specific victory conditions since the fall patch. I wanted to focus specifically on standard paced, deity victory conditions in this thread because I feel that at least with my experience of going from Immortal to Deity, there are certain victory conditions that you can pull off in Immortal but in Deity require a lot of luck.
I'm splitting them up between and warring and peaceful (except domination of course) because I feel they are quite different in approach. I'm also rating them on a scale of 1 to 10, with 1 being the most difficult, or in other words, requiring a lot of luck and 10 being the easiest, or able to consistently do without luck.
Domination, 3:
Very difficult. Maybe with Genghis/Wu on a pangea or rushing frigates on a archipalego might work. Then hope another civ hasn't run away and bomb/nuke the last few civs.
Science peaceful, 7:
Since the AI doesn't favor the science building line, the human has an advantage everytime a new science is buliding is built. Also I find the hubble telescope relatively easy to get even behind the AI 10% in tech. As long as you can get 3-4 decent cities out with an army to protect it and not killing your early science, this is a pretty solid victory condition.
Science warring, 9:
This is my favorite way to win. Very similar to a peaceful science victory, but normally have 1-2 wars where I try to secure some extra land for a science boost.
I find the best time for this is right around the artillery/Great war bombers phase. Artillery/bombers means you should be able to take cities regardless of annoying terrain and with the human vastly scales with range over the AI, so it's pretty much the best time to go to war. Pretty much, the more range a unit has, the better it can be used to exploit the AI in war, even if they have similar units.
With Venice, it's super strong in the medeival/renaissance time to buy a deity city state with all their delicious units and take out some nearby cities.
Diplo peaceful, 1:
Nearly impossible. Even if somehow the human miraculously gets the forbidden palace, sets the religion & ideology for the voting bonus, the deity AI is in general just too hungry for land, taking out half the city states and making a peaceful diplo victory nearly impossible. If you're lucky, it's possible enough city states are alive but very unlikely, need a lot of luck to hope city states don't get overtaken and that you're able to scure world religion/ideology. Also have to generate a butt ton of cash and hope the AI is too stupid to buy out city states (which they are for the most part, even after the patch, AIs will sit on 30,000+ gold and not retake CS allies).
Diplo warring, 4:
Doing everything like peaceful game except have to liberate/snipe a few CS.
Cultural peaceful, 1:
Need a lot of luck here. The AI will likely deny most/all of the early cultural wonders (globe theater, sistine etc). It's really hard to overtake the AI culturally with only 3-4 cities if this is the case. Also, f there is a runaway civ their culture will likely be so high that you can't catch up to them peacefully, especially without the early culture wonders.
Cultural warring, 5:
Similar to a peaceful cultural victory, if there's a runaway civ or you're denied all the early cultural wonders it's quite difficult. By attacking the highest cultural civ you not only kill their defense to your tourism (their cultutre), but you also boost your tourism. A strategic war to take out a high culture civ can actually make this game very winnable, depending on the proximity and military of the civ going for a cultural win.
General observations:
-Science is the only way I find I can consistently have a chance at winning peacefully. The others peaceful VCs require a lot of luck.
-Having at least 1 strategic war helps me in every single victory condition. I always plan on at least 1.
I'm splitting them up between and warring and peaceful (except domination of course) because I feel they are quite different in approach. I'm also rating them on a scale of 1 to 10, with 1 being the most difficult, or in other words, requiring a lot of luck and 10 being the easiest, or able to consistently do without luck.
Domination, 3:
Very difficult. Maybe with Genghis/Wu on a pangea or rushing frigates on a archipalego might work. Then hope another civ hasn't run away and bomb/nuke the last few civs.
Science peaceful, 7:
Since the AI doesn't favor the science building line, the human has an advantage everytime a new science is buliding is built. Also I find the hubble telescope relatively easy to get even behind the AI 10% in tech. As long as you can get 3-4 decent cities out with an army to protect it and not killing your early science, this is a pretty solid victory condition.
Science warring, 9:
This is my favorite way to win. Very similar to a peaceful science victory, but normally have 1-2 wars where I try to secure some extra land for a science boost.
I find the best time for this is right around the artillery/Great war bombers phase. Artillery/bombers means you should be able to take cities regardless of annoying terrain and with the human vastly scales with range over the AI, so it's pretty much the best time to go to war. Pretty much, the more range a unit has, the better it can be used to exploit the AI in war, even if they have similar units.
With Venice, it's super strong in the medeival/renaissance time to buy a deity city state with all their delicious units and take out some nearby cities.
Diplo peaceful, 1:
Nearly impossible. Even if somehow the human miraculously gets the forbidden palace, sets the religion & ideology for the voting bonus, the deity AI is in general just too hungry for land, taking out half the city states and making a peaceful diplo victory nearly impossible. If you're lucky, it's possible enough city states are alive but very unlikely, need a lot of luck to hope city states don't get overtaken and that you're able to scure world religion/ideology. Also have to generate a butt ton of cash and hope the AI is too stupid to buy out city states (which they are for the most part, even after the patch, AIs will sit on 30,000+ gold and not retake CS allies).
Diplo warring, 4:
Doing everything like peaceful game except have to liberate/snipe a few CS.
Cultural peaceful, 1:
Need a lot of luck here. The AI will likely deny most/all of the early cultural wonders (globe theater, sistine etc). It's really hard to overtake the AI culturally with only 3-4 cities if this is the case. Also, f there is a runaway civ their culture will likely be so high that you can't catch up to them peacefully, especially without the early culture wonders.
Cultural warring, 5:
Similar to a peaceful cultural victory, if there's a runaway civ or you're denied all the early cultural wonders it's quite difficult. By attacking the highest cultural civ you not only kill their defense to your tourism (their cultutre), but you also boost your tourism. A strategic war to take out a high culture civ can actually make this game very winnable, depending on the proximity and military of the civ going for a cultural win.
General observations:
-Science is the only way I find I can consistently have a chance at winning peacefully. The others peaceful VCs require a lot of luck.
-Having at least 1 strategic war helps me in every single victory condition. I always plan on at least 1.