You don't have to unlock them, they are a DLC that you have to buy :'( off of Steam .
3 Answers · Games & Recreation · 23/11/2011
You're playing it as part of the free weekend, right? Well with that single player is not available, you'll have to purchase the full game in order to play.
1 Answers · Games & Recreation · 21/04/2013
...you start out in the game and due to the change in companies from whatever to Steam , they changed the Medieval/Rome Total War traditions of unlocking nations, the only natiosn you have are the ones you unlocked ...
4 Answers · Games & Recreation · 13/04/2009