Age of Mythology: Retold

This achievement can be a little tricky sometimes.

Start a skirmish with the Norse using Thor
Settings:

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

Start:

1. Do not create Gatherers or any other troop except Dwarves and you can only use the 1 builder for this which you get at the start of the game (Berserk).
2. Begin by building the temple and the Dwarven Armory, the armory will give free dwarves. No need to upgrade to the next age in this game.
3. Build all houses to allow for max troops/units.
4. Set the town centre to auto create Dwarves only and leave idle until you reach max villager/dwarf limit of 100. You should have by the end 99 Dwarves and 1 Berserk (your builder).
5. The achievement likely hasn't popped yet, so you will need to create Hersirs from the temple to max out your total population which should be around 175. Once you're maxed out this achievement should then pop if it hasn't already.
6. So the final outcome should be 99 Dwarves, 1 Berserk and the rest all Hersirs. No need to win or complete the game.

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

This actually took me a bit to figure out what was going wrong. But I managed now.
It will take about ten minutes, if done properly. Start a skirmish with the AI on the lowest difficulty. Choose Thor. Set ressources to infinite and if you are comfortable with it, increase the speed of the game. Make sure in the general game options "auto-queue villagers in new towncenters" is off.
At the start auto-queue Dwarves built a temple and as many houses as you can. After the first temple is finished, age up and built ~ten hersirs. They will help speed this up.
After reaching the second age, built a forge, research everything there every age. Through Thor we will get more Dwarves faster that way. Built on every empty towncenter you can find and auto-queue Dwarves there as well. Age up, if you like.
Then built a fortress, age up and at that point timewise you should be good.

What I think I did wrong: recruiting any villagers voids the achievement. Even just having them queued seemed to do it, since one time I had never finished recruiting a villager, but the auto-queue through the games option menu queued them automatically. But that just as an interesting fun fact.

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