Explore a vast galaxy full of wonder! Paradox Development Studio, makers of the Crusader Kings and Europa Universalis series presents Stellaris, an evolution of the grand strategy genre with space exploration at its core.
Updated for version 1.0.3. No real changes. No need to start new game for this mod to be active. Don't forgot to choice it in launcher. Simple mod that added +4 to planet limit (9 core planets for most forms of goverment) and +10 to fleet limit, so you can defend your early expansion from aliens and pirates. Number of leaders have same limitation as in unmodded game.
Does this take away achievements in Ironman?
I belive that any gameplay mod do it.