F1 2021

I honestly boosted this with my roommates account on another xbox.

If you have access to another xbox, account and copy of the game (if not bought digitally), this, along with the other online achievements, will be very easy.

If you have the game digitally, use the other account on your home xbox so they have access to it.

If you're lucky enough to have a trusted friend, or find an LFG post, then that will also help.

In the Multiplayer Tab, select Social Play and create a session. Set your season to 25 races (easier to keep track since you need 50 and 100 completed races), set your assists and weekend structure, and invite your friend/other account.

You can turn off rules and flags to cut corners and take short cuts if you wish, and set the laps to 5.

If using another account, simply pause them when qualifying starts (if you have it), and pause them when you select to start the race before lights out. The AI will take over and continue driving, so you can just drive on your account.

Take the win and the achievement is yours!

This method is also good for "10 Clean Races", "Winning 5 Online Races" and the other online achievements of completing x number of races.