Age of Empires IV: Anniversary Edition

Think I've found a very easy way of getting this achievement that isn't as grindy as attacking enemies that the AI send.

Best thing to do is set up your game as follows:

Civ: Malians
Enemy Civ: Malians* (Easy)

Win Conditions: Any
Resources: Maximum
Starting age: I
Map: Revealed

Map: Dry Arabia (Anything except Islands to make easier)
Map Size: Micro
Biome: Any (I like European)

*The reason the enemy civ is Malians and Age I is because of their start game, for some reason they start incredibly slow on easy and just wander the map making mills and massing cattle for food, and don't really rush getting into the next age for some reason. Or at least they always did for me.

**TL;DR Version: Rush Age IV, Make 10 Archeries, Research everything to do with Musofadi Gunners, Make 50 gunners, go to building that doesn't hurt you, turn on stealth and shoot the building, retreat and repeat until achievement pops**

Not so TL;DR: Once you have these parameters start the game and let it load, take your time, the enemy isn't really going to attack you or do anything. Start out by rushing to Age IV and then make your archeries. I made 10, and researched everything to do with Musofadi Gunners to make them the best they can be (Not necessary, but you have time to do this)

Once you have a maxed out Musofadi Gunner, amass 50 of them and rally them all to 1 location near your base. Walk them over to an enemy structure (Preferably NOT a structure that fights back [Town Center, Outpost, Keep]) and press Q to make them go "invisible". Attack the building you have moved to and wait until the highlight around your troops has vanished, Move them away from the building to stop attacking it and wait 30 seconds for the stealth ability to recharge. Rinse and repeat until you get the achievement.

The achievement is for Attacking during stealth, not killing, so even peppering a building counts towards this, so long as they shoot the building while hidden by stealth.

Playing as the Malians, your Musofadi and Gunner infantry (trained from the barracks and archery range, respectively,) have the ability to stealth. This makes them invisible to any unallied players, human or AI, for twenty seconds. The goal of this achievement is to have your units attack hostile units while under the effect of stealth one hundred times in a single game.

This is very easy to rig in a match with a friend. However, if you are going for this solo, I suggest playing against an AI that is at least intermediate difficulty. Keep a force of several dozen Musofadi/Gunners at any chokepoint to your base. If you see the enemy approaching with an army, quickly stealth your force, then wait for your forces to attack the incoming units on their own.

If this takes too long, set victory conditions to Wonder and build one. This should make the AI more aggressive in their attacks.

Unlike masteries, the achievement will unlock while in game. You do not need to finish the match (although I experienced a one minute delay before my achievement popped.)

Note: you only have to attack the enemy, not kill them while in stealth. At times you will see your soldiers move to engage the enemy, but they are still under the effects of stealth. Just don't order them to move after cloaking them.