My point is more that their religion doesn't have a point. What do the Octopus Overlord expect and demand of their worshippers for the world?
I think it would depend on how you interpret them.
If its an aquatic religion, then might they be seeking to flood the world and turn it all into oceans? Adding some events or units that converts terrain into oceans would fit this goal.
Or are they psionic/telepathic like Cthlulu from H.P. Lovecraft and the mindflayers from D&D? Then they should seek enslavement of others. Give them heightened Charm Person powers. Maybe give them a wonder that give them a chance of forcing another civ to become a vassal.
The Octopus Overlords seeks domination. They were created when the Archangel of Greed and Mind Magic, Hastur, took control of the Angel of Water, Daladin. The Overlords are manifestations of Daladin's dreams, and want their people to serve them without will. Look aat their unique wonder, tower of complacency, it shows their mind control tendencies.
They do not need a unique victory, but they have a leg up on conquest vitcories. Tsunamis from waterwalking speakers is nigh unstoppable, so they can take coast with ease.
My overall point is that each religion should have some sort of goal.
The Hyperborean/Ashen Veil intends to bring hell to earth. The Mercurian/Order/Empyrean all ostensibly have the goal of stopping this. This is a negative goal, in that it isn't to accomplish anything, just stop something. A better goal would be to actually make something occur, i.e. instead of the Fall, they should have the goal of Return to Heaven.
The entire reason the Order was formed was to combat evil and stop it. Once that is accomplished, I imagine it would exist to stop any other threats.
The Empyrean is the opposite of the Order. While the Order is crusading agsint the heathens, the Empyrean seeks to redeem and convert them with reasoning and logic.
I suyppose if you wanted to rise to heaven you could try a Lunnnotar victory.
Likewise, FoL and Kilmorph don't have any purpose.
The Tree Huggers like to plant trees and spread ancient forests, but there's no victory associated with that. Maybe they could have a victory condition tied to spreading forests over a certain % of the world.
The rock grubbers don't even really have that. Perhaps give them a victory condition related to cornering the metals commodities.
The Fellowship of Leaves is the religion of the weakest ogd. He cannot control his worshippers, and he simply tends to his domain, nature. Thus FoL has many interpretations. When a Calabim religion it could highlight Darwinism and Prey vs. Predator, when Lanun it could be worshipping the watery side of Nature, etc.
The Runes of Kilmorph is very much interested in keeping on traditions and being industrious. It's only goal is to progress but honor the old ways.
Unique religious victories were never included because religions are not unified. At one point the Order became corrupt and tried to slay the true servants of Junil (including Valin Phanuel). Each religion/civ combonation can be interpreted differently.
And all the Grigori seem to want is to sit around and chill.
Lunnotar Victory!