Achievement: "Rome was destroyed in one day."

Hi guys, i'm doing some achievements at the moment and i'm having trouble with this achivement even on standard difficulty.

The achievement is to destroy all the castles in 30mins, there are 12 castles total. I'm having trouble moving around the map and gathering enough resources to fund an army.

It's nice to have difficult achivements but this one feels borderline impossible. The best i've managed so far is 7 castles destroyed in 30mins but it feels hard to try and improve on that.

Any help/suggestions would be much apprecitated.