Crackdown 2

This achievement can be done early in the game, either with an agency vehicle such as the super car, the buggy, or one of the stolen civilian or Cell sports cars.

To power slide, get a head of speed and hit "A" and left or right. During the nights the freaks come out in huge numbers, and you can slide through five or more enemies after a few tries.

If you're having issues getting the achievement, boost your driving level. With higher driving levels you'll get better performance from all cars. Additionally, you'll be able to requisition better vehicles from the Agency.

Note that this achievement can also be won in the demo, but won't unlock until you sign in with the retail version.

Unity Heights is an ideal location for this thanks to its dense freak population.

The supercar is probably best for this thanks to it's speed, but you can do it in the SUV and probably most other reasonably fast vehicles as well... Pick up plenty of speed, then when you get to a spot where there's plenty of freaks, just slam on the handbrake by holding down 'a' and yank the LS hard either left or right, hopefully throwing you into a slide that wipes out at least 5 enemies... The downside to Unity Heights is that some of the freaks will survive a power slide, but they're densely enough packed that it shouldn't be a problem.

If it is, you should be able to pick it up just across from the port, on the other side of the highway/fencing... The freaks are weaker here for the most part...

You can obtain this achievement fairly easily in the demo by maxing your driving skills to level 5 and performing a power slide at night on the freaks.

Or, get to level 2 of the driving skills and call in a drop for the Agency Buggy, this will allow you to easily perform power slides against the freaks.