At first glance, the Achievements in Crackdown 2 appear to encourage nothing but hours of grinding. Complete every blah blah, find every yadda yadda; that kind of thing. Scroll further down, however, and you'll remember why you love the Achievements from the first Crackdown. Rather than list them all, we'll give you just this one:
Yippee-Kai-Yay: Drive an Agency SUV into an airborne helicopter.