Skulls of the Shogun

You can unlock this on any level with a shrine, in any game mode. The easiest method is to create a local game with two players on the Chaos Canyon map, with unlimited time. Note which color is your primary profile and with the other one, haunt any of the shrines that generate a monk. In the middle of the map is the Crow Shrine, which is easy to reach with both teams. Once your secondary profile has haunted the shrine (which takes a turn), a Crow Monk will spawn. Move him and the soldier you haunted with out of the way to make it easier to select the shrine, and then end your turn. With a unit from your primary profile's army, haunt the Crow Shrine and end your turn. Immediately end your turn with the alternate profile and the achievement will unlock.

This can easily be done in the same session as "Outfoxing Death."