Age of Empires IV: Anniversary Edition

This achievement can be obtained very easily.

From the main menu, select single player -> Skirmish -> Create Game.

From there, go to the game setup tab and set starting resources to high and starting age as Age II. Select "Revealed" for the map state. I am not certain if sacred win condition must be selected, but I had it checked in my game.

Go to the map setup tab, and change the map to anything that is not separating chunks of the map with water. I chose "Nagari".

Now, on the left side of the screen, make sure you select your race as the Holy Roman Empire. Add three additional AI players. Their race does not matter. Set yourself and two of the AI players to Team 1. Set the last AI player to Team 2. Set your allies AI difficulty to hardest, and the enemy AI difficulty to easy.

Now, you are ready to start the game. Once the game starts you should have several villagers. Select them all and immediately have them start building your landmark which will get you to age III. The landmark you choose does not matter. Immediately after this, select your town hall, and start building a Prelate. This is a religious unit that can start converting sacred sites once Age III hits.

Now, look on the mini map. You should see lots of different icons since the map is revealed. Look for a black and white Circle with an "X" through it. This is a sacred site. Immediately once your prelate finishes building, send them to the nearest sacred site. Make sure they are inside the white radius of the sacred site, and the moment your villagers finish building their landmark, your prelate should begin capturing the sacred site, and the achievement should pop up shortly thereafter. Your two AI allies should make short work of the enemy to finish the match if you want to finish out the rest of the match without quitting.