Age of Mythology: Retold

This is an easy achievement.

Start a skirmish with the Egyptians using Set
Settings:

• Standard Mode
• Game Speed Fast
• Infinite resources
• Reveal all
• 12 AI Players

Start:

1. Begin by building the temple and then upgrade to age 2 and be sure to choose Anubis which will allow you to create Anubites at the temple.
2. Build all houses to allow for max troops/units and make any upgrades at the temple for this troop type.
3. Create Anubites via the temple and then send an army of them to the enemy base and manually target the villagers. Go from base to base killing the villagers until this achievement pops.
4. Build more temples to produce Anubites at a faster rate if needed.

If you need more help with this you can follow my video guide below which will begin at this achievement:

Start a skirmish with as many AIs as your PC can handle on the lowest difficulty. Choose either Isis or Set. Set ressources to infinite and if you are comfortable with it, increase the speed of the game.
At the start built a couple of temples and as many houses as you can. After the first temple is finished, age up choosing Anubis.
After reaching the second age, auto-queue Anubites in all the temples. Once you reached max, go once around the map. Attack move the Anubites into an AIs settlement. They should have five-eight villagers. Once those are dead, leave the settlement and move on to the next AI. Depending on when you do it and how many AIs there are, you'll be done around the eight visited AI. Reinforce your Anubites as needed.

The AI will not attack your base, so you don't need to worry.