Crackdown

Each of the stunts CAN be done at the 1-Star driving skill, but the Long Jump is extremely difficult. No matter the speed or the vehicle I would use at the lower levels, I could not get the Long Jump. I HIGHLY advise getting the 3- or 4-Star skill levels before attempting these.

I also advise using the Agency tunnels, but I would also highly recommend the Beach on La Mugre, near the amusement park. There are four beach houses, each with ramps on the front of the building that are SUPERB for launching off of.

Additionally, on Los Muertos' upper island, they have a very large coliseum with an indoor stunt track. AND, if you don't have the Buggy, there are two ramps angled specifically FOR doing barrel rolls. Nice.

BARREL ROLLS - I recommend the Coliseum, Beach, Tunnel #2. Tunnel #1 isn't bad either, but it's fairly easy to run into the wall before you have the chance to complete it. If you have the expansion DLC with the extra vehicles, use the Buggy. You'll get it REALLY easily. If not, use the Agency SUV.

FLIPS - Again, I recommend the Coliseum, Beach, and Tunnel #2, but Tunnel #1 is excellent for the back flip too. I'd recommend avoiding Tunnel #1 for the front flip, though. It's a little harder. Again, use the Buggy if you can, but otherwise, Agency SUV is best.

LONG JUMP - Beach, Tunnel #1, Tunnel #2, or Tunnel #3. I couldn't execute this for the longest time. Finally, I tried out the Agency SUV with 4-Star driving skill. I headed down Tunnel #1 to La Mugre, and as soon as I was about to ramp out the tunnel, I hit B to jump. If you copy this out of ANY of the tunnels OR on the Beach, you will SOAR. When I did it, I jumped clear across the highway and through to the intersection up the hill on La Mugre. Without doing the SUV jump, though, I couldn't get it to register at all, and I tried seriously EVERYTHING I could come up with. The Buggy is normally the best for jumping without the 4-Star rank, but I couldn't get it for anything with that. If you have trouble with this one, get the 4-Star rank THEN come back with the SUV. You'll get it in no time.

I was able to get all the stunts for this achievement by bunny hopping the SUV off Cowell's Tower (see any of the guides in Front Flipper for more details), except the long jump. For the long jump, I give the props to Kojiiriin. I just want to give a few more details about it.

The tunnels he's referring to are the tunnels out of the Agency Tower (#1 goes toward Los Muertos, #2 toward The Volk, etc.). For the long jump, go down tunnel #1 with the SUV. Try to keep the speed around 170 MPH until you get to the red marks on the ground near the end of the tunnel or you'll come off the ground at this point and you won't get a good bunny hop at the end of the ramp. Just as you hit the red marks, begin fully accelerating and charging the SUV's bunny hop ability (by holding the B button). Release B just as you exit the ramp, and you should go flying just as he predicted.

Regarding the ramps in the arena for barrel rolling, I tried and tried to get them there, but either I couldn't get enough speed to complete the barrel roll, or I would hit one of the rafters. I tried the agency supercar and the gang cars that were around the arena. If anyone has been able to get a barrel roll there, I would love to know the specifics on how they got it.

BEST SOLUTION FOR LONG JUMP: USE SUV AND JUMP FROM TUNNEL 2. Tried so many times on the beach + Tunnel 1 with no luck. Did it first time from Tunnel 2. I was Level 4.