Deadliest Warrior: Legends

This is much easier with 2 controllers.

Just go to: Multiplayer - Generals - Duel
Characters don't matter either does the map I just chose the 1st map called Unshakeable.

(Step 1) Once the game starts just put all of your reinforcements at your castle & take over whatever territories you can on your way to the first castle.

(Step 2) After you end your turn just pick up the 2nd controller place all of the reinforcements at their castle & then end their turn.

Then just continue on with steps 1 & 2 over & over again until you take over the 3rd castle & after you win the Champion Duel & activate the 3rd General Ability the achievement will pop.

Afterwards you can either exit the game or finsh off your 2nd controller the choice is yours.

Make sure the difficulty setting is on easy. I chose to do this with Alexander and it was simple enough.

Essentially all you have to do it capture 3 neutral castles and activate each ability.

If you want to get in depth, I would recommend boxing the CPU down in the corner of the map so you can capture territies and castles without having to worry about the CPU doing it first.