This achievement requires the most amount of grind from all achievements for BF2042. There are other ways to do it, but personally I just did not like doing it in normal rush/conquest game modes, because not only do you have to wait for a vehicle, but also because after getting said vehicle, you'll become wanted prey by every engineer on the enemy team. And also it relies heavily on just pure luck.

So here's the deal. You start by setting up your own server on this site: https://portal.battlefield.com/experiences
You'll choose the core game mode (Custom does not count towards masteries.), specifically large conquest. You can choose whatever map you like the best, however, Breakaway is the best one for this, since it has 8 capture points.

Now the most important part - in game mode details, you'll change flag capture time from 1,0 to 0,1. 0,01 will not work. 0,1 is the lowest value that works. This is the only modifier that you will need to change.

Then just host the game through Portal and play it yourself. You will start on top of the map. For this method, you will need to choose one of three vehicles that get points for capturing flags :
- LATV4 Recon (1 600 for T1 mastery)
- YUV-2 Pondhawk (800 for T1 mastery)
- LCAA Hovercraft (1 600 for T1 mastery)

Then just capture all the flags, then restart the server and do it all again. Depending on your PC and internet, you can get around 8 points in 3 minutes. If you have T3 mastery, you will still need 1 120 points. So you will have to do it for the whole 7 hours. Yeah, it sucks like hell. I know. Still better than to play it with other players and rely mostly on luck with SOFLAM.