One downside with modding is that the game engine does not usually stand up well to huge expansion TC mods. It becomes very unstable and strange bugs surface. So watch out for that. If this game is as good as I think it is, it will be king for the next few years and any future 4...
A few achievements are particularly difficult because it requires an empire to act in a certain way beforehand. There are multiple ways you can switch from one empire to another: If you use save editing to take the save off the ironman mode, you can use the "play" console command to ...