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As the achievement description says, you do not need any temp perks for this achievement. Just the permanent ones]
This is the method I've been using to get skill points (skip to
6:20 to see the area):
The idea is to buy a Ram Runner, convert the drivetrain to RWD, switch the engine to the V10 (
not the V12) and fully upgrade the rest.
Then take it to just south of the airport, where "DRY RESERVOIR" is displayed (I stick to the part just southeast of the writing). Drive over this terrain in circles and you'll get lots of air/destruction/drift skills. You can get a 50,000x6.0 combo in about two minutes. There isn't much to look out for, just a few dead unmoveable trees. I've never rolled over doing this method.
To speed this up, work on the "skills" part of the tree first and buy these perks as soon as you can:
Also use the skill songs!
Calex dEUS recommended listening to "Timeless FM" as the songs are longer than other radio stations (sometimes over 20 minutes), giving you more time of double skill points.
AH GamerScore added some important points. There is a maximum of three skill points for one combo, so aim for a maximum of 300,000 points. This means 50,000x6 or 25,000x12 if a skill song is playing. You can also use a skill boost horizon edition car instead of the Ram Runner to speed up the process (you can get them from a wheelspin or the auction house) however there's an increased risk of rolling over.
Hope this helps, credit for the car and location goes to TC9700Gaming