After some hours of training you can easily reach "2,000,000" points but the achievement only trigger with "5,000,000" points (developer said it's going to be updated), can be hard to some people get all this points, so two of the options to do this now are:

-Go to a Drift Track and don't lose your score in the process, the chances are good, but require skill and focus.
-You can do it the easy way in a big Driftkhana map (Sendai for exemple) like the video below:

https://www.youtube.com/watch?v=wb-4ErgW8No

-Going faster give you more points.
-The more sideways you go, more multipliers you get.
-You only need the handbrake if you need to force a drift.
-Learn how to use the acceleration properly, because that is the key for drifting no matter where or game.
-At AD you can use the normal brake to lower the speed of your car even going sideways.
-The cars have different properties, so choose the one that fits better your style.
-Drifting close to poles give you some extra point, but don't waste time trying to reach them, because normal drift give a lot of points as well.
-Don't lose your drift, multipliers are the best way to get points, if you do something wrong: just force a drift and it will continue to count.

I hope it help some people that missed this achievement, have a great day!