Age of Mythology: Retold

I just now did it in ten minutes. Start a skirmish with one AI on lowest difficulty. Set ressources to infinite. Start with Kronos. If you are comfortable with it, increase the games speed.
At the start auto-queue villagers and build a few temples, go to the next age choosing Prometheus (he helps us speed things up). While that is happening, scout towncenters and build houses.
Once you reach the second age, built a forge, advance to the next age choosing whoever, start building additional towncenters. Auto-queue villagers there as well.
Once you are in the third age, built a fortress and advance to the fourth age choosing Atlas.
Once you reached that age, autoqueue Argos. You don't need 666 units, as you only need their eyes. I was surprised when it popped when I had somewhere between 30 and 40.

I never got attacked once by the AI in the meantime.

This is an easy achievement.

Start a skirmish with the Atlanteans using Kronos
Settings:

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

Start:

1. Begin by building the temple and then upgrade to age 2, choose any god you wish.
2. Build the armory and then upgrade to age 3 via the town centre, choose any god again.
3. Build the Palace and then when upgrading to age 4, be sure to select Atlas which will allow you to create Argus at the temple.
4. Build all houses to allow for max troops/units and make any upgrades at the temple for this troop type.
5. Create Argus via the temple until this achievement pops. You won't need 666 it's around 20-30 units I believe.
6. Build more temples to produce Argus 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: