F1 2021

Pretty easy achievement to get. From the Main Menu, tab over to Solo and go down to Grand Prix.
From here, select the F1 2021 cars, then select Monza, which is the 12th circuit in the calendar.
Either select Ferrari or AlphaTauri and then whichever driver you please.

Under weekend structure, I changed it to One-Shot qualifying (which will get you closer to "1 Lap is all I need" achievement". I also changed session length to Very Short which means you only have to do 3 laps. Under Simulation Settings I had the AI difficulty set on low - but that is your personal preference.

Once that's all setup, start the session, grab pole and then the win!

Nice and simple and this is the same method for other-related achievements like this.

Really Easy Achievement

Obtained after winning a single player "Grand Prix" in Monza with a Ferrrari or Alpha Tauri. To do this, select the "Solo" category in the main menu and start the "Grand Prix" game mode there. The track "Monza" (Italy) and then any driver from the Ferrari or Alpha Tauri team must be selected in the driver selection.
The other settings (race distance, simulation options, AI difficulty and driving aids) can be selected as desired. The trophy is unlocked after winning the race.