To get this achievement, start a Free Race Trailblazer in Utah at Hurrah Pass and ensure in Race Setup that Damage is set to FULL. Choose a quick car (easiest is probably the Evo IX - Thanks Spilner1001, but have confirmed it will work with the Evo X, Solstice GXP and BMW Z4 M).
From the starting line, floor it. You'll pass over a ridge, and start coming down a hill to the left and will get up to above 225km/h (140mph). At the bottom of the hill, just run into a tree/rock/etc and Achievement Unlocked.
If you're still having difficulty, you can change your car's setup to favour top speed instead of acceleration - thanks sharndowg.