Spoiler! Project Nemesis doesn't unlock

[MadSkunky]

I qoute myself from the other thread:

@MadSkunky

There should be a goal on the global view that NJ builds their big Command Center (or something similar) anywhere. If this is ready you have to defend it together with NJ troops against a big bunch of pandorans and after that you get access to Project Nemesis.

You can also look here on a Techtree: Tech tree out there? - #7 by LouisdeFuines
As I said above, after the Command Fortress research NJ buils this in one of their heavens, that will take some time, and then you get the mission “City Upon A Hill” to defend it.