HOT WHEELS UNLEASHED 2 - Turbocharged

This will probably be your last achievement to grind out, but there is an easy method to drift the remaining centimeters/inches once you finished everything else. Go to the Industrial Area and select the Waypoint Race "A New Challenge - Highway Oasis".

In this level there are several locations where you can grind infinitely. On the grass or on the road next to the parking car once you start a drift you can keep drifting in a circular pattern by holding the accelerate button and one of the directions. It works with most cars, but use a Twin Mill that has good speed, acceleration and handling. You do not need to worry about not finishing the level on time, the distance will be credited once you finish the race.

Here is a video I made that shows three good locations on that level to grind drifts:

Grinding this out will take some time as you can expect to gain 1% progress per 1 and a half minutes of continuous drifting. You can do this grind by entering a Waypoint race on any course and finding an open area to do a donut while drifting. Just continue to drift in a donut to gain progress; however, you will need to complete the race and return to the main menu for your progress to count.

Quick Modes > Single Player > Time Attack > 'Community tracks' > (View 'LM/Select') Search > Name: Like lightning! > (Menu 'RM/Start') 'Apply and exit' > to 'Add to favourite tracks' (if not done in one go) > Select 'Like lightning!' > Select vehicle > Continue > Just hold to boost round circuit for 'Like lightning!'🏆, and also tap to initiate a drift and hold for the ½ million centimetres of drifting for 'Drifting teacher'🏆 (my '24 Ours' car can continuously drift the loop, but you'll want a very fast vehicle to do 500,000 cm!).
The achievement tracker only updates after you Exit and return to the main menu, but you will unlock 'Like lightning!' and, eventually, 'Drifting teacher' mid-race when the totals are reached. I did almost 10% of the required drifting in 5 minutes, so it's about 2%/min, depending on the vehicle (the Hyperboost 7th skill probably speeds things up. See: 'Better too much'🏆).
See: Solution for Like lightning! In Hot Wheels Unleashed 2 - Turbocharged
Alternatively, use Track Builder to create your own mini circle Circuit, adding lots of Boost Charge Bumpers (not Boost Triggers - auto-boost doesn't count as boosting, but triggers are better if just drifting, as you don't need to hold ) all over the track and validate it for the 'Stage animal'🏆 achi, then Share and use it in Time Attack (has to be shared for use on Time Attack).
Leave this achi till you've finished 'career' mode, and you'll have to grind this less:
Assuming the servers being dead: Quick Modes > Waypoint > 'Gas'n'roll' (02 Gas Station) is possibly your best alternative, as the waypoints refill your boost, and it was the longest one according to the leaderboards.