Age of Empires Online

In Nubia you will eventually get a quest called "Gold One Way" where you need to get gold for the Vizier. Finishing that quest will unlock Libya for questing. Upon arriving in Libya, begin doing quests for Prince Sesostris, it'll only be a couple until the Vizier's Doom. After escaping from Libya head to your capital for another quest from Sesostris, "The Supporting Cast", which is a quick run through quest where you need to stop off at 3 temples to recruit aid. Finally, the last quest will become available, "Vizier's Doom", which is very simple.

The main strategy of the quest is straightforward. Start off by walling up your village completely and use the resources to your NE/E to amass at least a medium sized army. Be wary of enemy attacks pretty early on with siege and elephants that will come straight down from the immediate north. Putting a Fortress on the cliff overlooking the northern wall of your base will help a lot with this. Build your favorite units, no real preference (elephants and priestesses of course) and once you have a decent sized force just push north. The main force consists mostly of camels, although you'll probably be encountering more towers and a couple of fortresses that will do more damage to you than the small army, the enemy should have (depending on how long you took to attack).

All in all, very straight forward and it will award you with both this achievement and potentially your last pyramid blueprint for the 'Pyramid Power' achievement.