You can do this solo, select cutom match/Solo/Invictius.
You start if by killing the barbarian gurads, there will be 4-5 'barbarian guards. Then you move on the burn the wickermen by kicking over the fire things. The next objective is to kill the barbarians attacking the temple, there will be about 10 barbarians for you to take out. You must then take and hold the temple. Move to the temple and stand inside it whilst killing enemies. The temple will rebuild itself as you kill enemies. Then you'll have to kill the remaing barbarians and rebuild the bridge whilst killing the enemies. Be careful here as big circles with skulls in them will appear on the floor. Do not step in these as archers will shoot in them. Once the bridge is rebuilt you'll have to detroy two catapaults and kill about 15 barbarians. Then a statue of the emporer will rise from the floor and you must protect him. If you fail and they destroy the statue then you must kill all the enimies. the mission will end and pop goes the cheevo.
If you give this negative feedback please tell me why so I can improve :) .