Anyone know how to do one? i just unlocked the Manhattan, and im aiming for the Daredevil acheiv.

You need to drive over a ramp that has a ramp extension on it. So far, I've only managed to do 1 barrel roll, but according to the developers, there are some ramps which can get you upto 4 barrel rolls, which is pretty insane.

Ramp extension? and by big jump on middle of map are you talking about the huge series of jumps near the dam?

Also, is their a certain way you have to turn the control stick or something?

no you hit the jump at an angle like half hanging off and god fast and there ya go. i got 5 on one jump over the island.

Head over to the quarry...cant say exactly where it is but its on the left side of the map?? Jump right off the ramp at the top and you can do the double barrell roll easy.

Dude, there are certain ramps all over paradise city. These ramps look like a normal ramp on half of it, and the other half has a extension, that will flip your car.

If your trying on normal ramps, you gotta hit it so half ur car is on. Some cars are crap at it as well

Read Avenue..it's beside some railroad tracks Go flying up the road hit the raised ramps = 3/4 barrel rolls

Keep one set of wheels just about on the ramp as you launch to initiate a barrel roll. It takes a while to get the sweet spot.

go to the beach to the far right of the map. theres a good spot

Hey barrel rols are eay once you get the technique. Try practising on big surf beach. Ive landed a 5x at the quarry :]