Age of Mythology: Retold

You can complete this quickly, its possible to just reload a save. its how i did it:

Skirmish with one AI on lowest difficulty, infinite ressources, game speed set to normal or fast, its up to you.
choose any God you like it doesnt matter, i took Poseidon, advanced to ages 4, built a few temples and just spammed a ton of hydras on the AI base for fun
Remember to make a manual save just before killing the last units/buildings. If the AI want to surrender, choose yes.
When the winning screen appear, press quit and you will be sent to the main menu. from here press Continue and it will load your previous save, just repeat until it pop. if your save is bad, you can always make a new one closer to the win.

Note that this methode work for any achievements which doesnt ask to do the requirements in a single game.
i reloaded a save a couple time to kill 100 villagers with Fenris wolf or for the Caladrias healing.

Skirmish 1v1

Map: "Tiny" (It spawns you with pretty much infinite resources, the map is SUPER small, like few buildings wide)
Game Speed - Fast
Bonus - On (Give yourself a 500% boost to help with build speed / Ageing Up)
AI -Standard/Standard

I just played as RA (Enemy was Hades) and rushed a few scarabs to make quick work of their buildings. Try to make quick work of them until you surround them and then rush the town center. Once it breaks they should have a hero unit that is tanky (Mine was the centaur guy, Charon) as well as a few other units your beetles can make quick work of. Eventually surrounding the hero so they can't move.

Once you get him to super low health (I'd say 5-10%), immediately save a game named: 100 (This causes it to be the top save). Win the game and after hitting "Quit" just load the save.

On Xbox Series X I got a win every 10-15 seconds including load times and Quit. If you are on Xbox or use controller you can do it super-fast by pressing DOWN, RIGHT, DOWN, A, DOWN, A: before the menu even loads. Just as soon as you hear the menu music play do that button sequence.

(I have my stuff Private. If you would like a Game-clip or Screenshot for an example just message me on Xbox but I think it's pretty self-explanatory.)

i tried a few other methods but they seem to not count, so i found this be fastest way that's guarantee to pop it in about 30-50 minutes depending how fast you are.

Game type: standard
Victory condition: sudden death
map: any land - did Acropolis
Map size: standard
Visibility: revealed
Difficulty: standard
Resources: infinite
Speed: fast
Player count: 12
Faction: odin

build temple then age up age 2,
make additional temple houses till age 2 completed,
make armory and age into age 3 choosing mountain giants.
continue make houses and temples till age 3 done - aim for like 10 temples
once age 3 completes make mountain giants and go kill AI starting town centers, once the AI loses their town center they are eliminated, if your quick you can eliminate all AI town centers in less then 5 mins i some times managed it a tad faster.
rinse and repeat 10 times and should pop.

A very fast method which worked good for me was:

Game type: Lightning
Victory condition: sudden death
map: Megapolis
Map size: standard
Visibility: revealed
Difficulty: standard
Resources: infinite
Speed: fast
Player count: 12
Pantheon: Oranos
AI Pantheons: Oranos and Kronos ( so they can´t use annoying Godpowers such as Ceasefire and Fimbulwinter.
I also did a Video Guide about this:

I didn't have much luck with any of the above options, but i saw a video on youtube from "dandyrew" that worked wonders.

start a skirmish match with 12 players with these settings:

be zeus
have 11 ai players
standard difficulty
allow bonus, give yourself 500, and ai -95 (this keeps them from building a lot and expanding, and you can build and upgrade super quick)
infinite resources
tiny map (actual map name)
disable titans
game speed is fast and map is revealed

when it starts make multiple temples
advance 2nd age (god doesnt matter)
build lots of houses
build armory
advance 3rd age (i chose apollo for underworld passage which can be helpful)
build fortress
advance to final age (choose hephaestus)
build and upgrade a ton of colossi and send to destroy bases.

notes:
underworld can help transport colossi around,
more temples means more/faster unit build,
select a group of colossi on the edge of the map and use an attack move to the other side of map and they will crush everyone along the way.

this took me 5 tries i think, after i had completed all other achievements.
process took me 20 minutes maybe.
have fun and make good choices