This is not a guide to tell you how to do this achievement, its rather easy, kill the captain before he escapes, light the fire, tower is yours......rinse and repeat.........
Edit: Plain and simple, The last one is only available once you start Sequence 7But rather its for people like me who want to know how early you can possibly get this achievement...........
You can get all towers
EXCEPT three
BEFORE Sequence 6............
Once you reach Sequence 6, you can get the two top Eastern towers, to be honest, I can't remember if I had to do a certain tower before the other one, but I
AM sure you can get those two before you even start
Gatekeeper 6-1The last one is available once you start Sequence 7 (which is where the
last Lair of Romulus is located)
I hoped this helped a little bit, because I was wondering myself when I can reach that last area!!!
If you feel the need to down vote, please tell me if I'm missing something....I kept track of when I was able to unlock all areas........
Edit: I was incorrect about that being the
LAST Romoulus Lair, the last one is actually in the Vaticano District, only available after Sequence 8, sorry for the inconvenience.......