As the vast majority are here to achieve 100 rounds in Italy, I'll get to the point.
Although the map cannot be chosen in any game mode, it is still within the game files so we can open it through the console.

1) We must activate the developer's console: They can activate it from the launch parameters or assign it a key from the game itself.
2) We will write the following commands: "game_type 0; game_mode 1; map cs_italy"
They should copy all the text that is between the quotes.



This makes us load the map of Italy in its competitive mode against bots.

The achievement, requiring 100 rounds, will take a while to beat the bots 16-0 but it is still better than waiting for this map to officially return to CSGO.
So that you believe that you can obtain the achievement in this way I will attach a screenshot where you can see that I obtained this achievement 1 or 2 days before creating this guide. If you wish, you can enter my profile, see my achievements and check it yourself.