Age of Empires IV: Anniversary Edition

This achievement can be acquired during the 6th mission in the Mongol campaign called the Battle of Mohi. The goal is to kill 2x times more enemies as your ally that will cross the bridge either after the 15 minutes are up or after you flank them. I did this on the easy difficulty because with this strategy you will not be having Batu's support.

I found a pretty good tactic that always guarantees that I get way more kills than Batu and his army. After you build a pretty decent-sized army (I had 11 Lancers and 44 Mangudai) have a few villagers build two towers right in front of the bridge on your side of the river. Next, build a siege workshop right in front of the two towers. Here's the most important part. Before Batu Khan attacks, make sure you have built 3-4 Mangonels and have them placed on the bridge ready to fire. This will prevent Batu and his army from getting across the bridge. Make sure they are lined up and block access. If you want to test if the bridge is completely blocked before Batu attacks take a villager and try to have him cross. If done correctly the villager will keep zigzagging and not move past the Mangonels.

(BEFORE GOING ANY FURTHER MAKE SURE TO SAVE YOUR GAME. That way once you get your achievement you can have the option of loading it back so your army isn't the only one that took heavy losses).

You can either wait for the timer to go down or attack their flank when you're ready. While you get your kills, Batu will do nothing but watch on the other side of the river. Guaranteeing that you get way more than 2x the kills than he does.

The achievement will unlock once you have defeated enough Hungarian troops. This may take a while and will involve you pushing even further North until you have met the required amount of kills. Mine unlocked as soon right before I had completed the "Drive the Hungarians back to their camp" objective.

Tip: If you're unsure how to deploy the Mangonels, simply select one and press attack move. Wherever you click they will move there and then finally transform and be able to attack. I suggest also building a market to sell all the excessive meat you gather in order to have enough gold to build mangonels (unless you're directly mining for it).

If you're satisfied with the achievement and want to continue the mission, I suggest moving the Mangonels and destroying the towers so Batu and his army can get moving. It will take a few seconds for the AI to learn that the path is free and will eventually cross the bridge.

Cheers