The DLC contains 3 new cities, and the best city for these achievements is in Motor Town, the 3rd city. Progress through the game until you reach the level Driving Squad.

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When you load the level, you'll see 3 cars spaced one parking spot apart.

Using the Car Swarm, click one of these 3 cars, and hold down the D button, or hold right,
depending on your control scheme.

By holding right, the cars don't hit each other.

Continue this for 15 seconds, and all 3 achievements will pop up.

Thanks for reading!