F1 22

This achievement is for the Team championship rather than the solo championship.
This is easy enough as long as you are consistent.
I chose a full 22 race season but I'm sure it will work on a custom length season too.
I Also set the difficulty of the AI to 25. This is easy enough to stretch a gap of 4-5 seconds a lap, but you can set the difficulty way down to 0 if you wish to.

The key here is to win as many races as possible and get the fastest lap in each race in order to get the most amount of points possible for your team.

I did this in the My Team season so you create a team and choose the engine & Livery, team mate etc.
I had Senna as my team mate hoping he would rack up plenty of points but he was useless and didn't. Even without his help I won all races bar Saudi Arabia and also got the fastest lap on every track bar Saudi Arabia. (Getting a good starting position in qualifying is key on street circuits so its a good idea to have flashbacks on)

The championship was won with about 5 races to spare and the achievement popped up on the screen as soon as that race was finished and I pressed advance. (I didn't have to wait until the end of the season for it to pop).