This was so much easier after I tuned my car to perfection. I was able to complete 6 different PR Stunts with 3-star ratings. Just a "heads up", I have all festival locations upgraded to at least level 4 so if one of the places I mentioned isn't there for you, that's why. I used 2 different tunes for this achievement. For the Drift Zones I used my tune named "Throwing Weight" and the description says "Throw Your Weight Achievement." For the Danger Signs and Speed Zone I used my tune named "Clever Girl!" and the description says "Clever Girl! Achievement." You can also search for the tunes using my gamertag. As Calex dEUS noted below, you must be using the standard 2017 Ford F-150 Raptor to get these tunes and complete the achievement (thank you). All of the locations I chose were super easy and never took more than 1 try after using these tunes.
Rainforest Reveal Danger Sign
Shipwreck Danger Sign
Byron’s Leap Danger Sign
Silver Sands Drift Zone
Kiewa Valley Drift Zone
Central Yarra Speed Zone
Gold Mine Danger Sign (AussieBigfoot)
Gold Mine Speed Trap (AussieBigfoot)
Hilltop Speed Trap (AussieBigfoot)
North Arid Plains Speed Zone (NMANOZ)
South Arid Plains Speed Zone (NMANOZ)
I hope I helped :)
EDIT: Thanks Calex dEUS, AussieBigfoot, and NMANOZ for the additions. I provided the best tunes and locations I have come across thus far to finish this achievement easily, but if you have a problem please reach out to me before downvoting.