Age of Empires Online

For this achievement you must complete the quest "The Fate of All Traitors," which tasks you with amassing a huge army to escort your general into battle. In order to do this, you can spread your city out along the Eastern bank of the river and continue gathering resources and building many buildings: fortresses along the river, all unit training buildings, and anything else you'll need to fortify your army for it's attack. Be sure to stay on top of building new houses, new town centers, and advancing in ages whenever you can to maximize the size and strength of your army. Once you feel comfortable with your army, send them into the enemy's city, taking out every barracks, archery, range, tower, etc. until they reach the enemies town center and take that out.