Age of Mythology: Retold

I just now did it in five minutes. Start a skirmish with one AI on lowest difficulty as Ra. Set ressources to infinite. If you are comfortable with it, increase the games speed.
At the start auto-queue villagers and build a couple of temples, go to the next age. While that is happening, scout towncenters and build houses.
Once you reach the second age, auto-queue priests and build a few more buildings. You can empower basically anything but houses and walls. I had five temples in addition to the starting four towers and town center. So I just built five other buildings. Then empower them with the priests (you need at least 14) and the pharoa and you are done.

This is an easy achievement.

Start a skirmish with the Egyptians using Ra (or any)
Settings:

• Standard Mode
• Game Speed Fast
• Infinite resources
• Reveal all
• 1v1

Start:

1. Begin by building the temple which allow you to create Priests for Empowering.
2. Build 15 Granaries which we will use to be Empowered.
3. Build 1 or 2 houses to allow for 15 Priests.
4. Create 15 Priests via the temple and then make each one of them empower a Granary, once all 15 Priests are Empowering their own Granary all at the same time then this achievement will pop. It's also possible to empower other buildings if you don't want to use a Granary.

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