Wanna win Deity without the AI cheating? Here's how!
Set up a game, pick any civ of your choice, set it to custom turn limit, turn it to 1, set difficulty to deity or difficulty of your choice. Start the game, found your city, end turn and bam, you just won on deity by doing nothing, enjoy!
Should look something like this.
And your achievements should then look something like this.
Have fun!