Ozymandias: Fast Method to Get All Achievements

Currently, there’s only one type of achievement in this game: Win as A civilization on B map at Scholar difficulty or higher
So winning fast is the way to grind the achievements. And here’s how: edit the victory condition.

You can click the crown icon while in the civ selection phase. Click the pen and paper icon on top right of the window, – and + buttons will show up next to the wonders. (or you can move the mouse cursor on each wonder to see the button). By clicking “-” button the wonder’s amount of crown is lowered and the condition becomes easier, and if you make something worth 0 crown the wonder is disabled. Disable or make it harder to get every wonders, except one that you are aiming. Also change the crown need for victory to 1.

About the wonders you should be aiming, the Mausoleum(Capture 1 city) allows the fastest win if conditions are met. If early rush isn’t viable, go for Hanging Gardens(250 wealth) instead. If the starting position is too bad you can try the Colossus(5 Armies and Fleets).

With this method you can easily win around turn 15. If the civ has good start it’s possible to win even before T10.

Since you only have to capture one city to win, you can just focus on that and nothing else.
Cancel food buying turn 1, if you are close to the target. Buy tiles to connect borders, don’t put flag on unnecessary tiles. Accumulate wealth to buy an army. Some civs have weak wealth generation early so you might have to buy a level of reduced wealth waste upgrade.

Buy power on x terrain tech to capture tile(s) next to the target’s capital, and when you capture one of those tile buy power on city tech. Buy power with wealth if needed.

Here’s an example of a fast rush game, pre-T10 victory.