Need for Speed Hot Pursuit Remastered

A good place to try this achievement is in Memorial Valley, available fairly early on. The very first mission of this area is a Hot Pursuit called "Breach of the Peace" with 3 roadblocks along the path. Just be careful of your enemies overtaking you just before the roadblock and hitting some of its cars, thus voiding the "undamaged" requirement.
Other guides for the 360 version mention that, aside from completely avoiding the roadblock and taking a shortcut as long as you're in first place" (like the guide below suggests), you can also use an attack (you have 4 spike strips available in this mission) and if the timing is just right, the crash cam that happens when it works should "shift" you through the roadblock unharmed but I think hitting the gap between the cars in the form of a simple wooden obstacle might be more consistent.

As Achievment states but you can also get this one by taking a shortcut around the Roadblock as long as you are in first, it should appear.