Crackdown 2

It's not completely necessary but it will definitely make things easier if you level your strength up a bit before going for this achievement, enemies die faster when you throw heavier objects at them but to pick up heavier objects you need to be stronger!

Personally I think it's best to wait until you're at least Lvl 4 Strength because then you'll be able to pick up most of the vehicles which when thrown will kill the freaks instantly!

So, wait until nightfall because that's when the freaks come out and then grab a car by holding "B" when stood next to one, sometimes your agent will pick up the car door instead, just drop that and pick up the actual car, find yourself a crowd of freaks and then throw the car at them, the achievement isn't timed so you don't need to rush yourself while going for it, just keep picking up cars and throwing them at freaks until the achievement unlocks!

You can track your progress toward the achievement by bringing up the menu, going to the "Achievements" tab and finding this achievement!

* ^{Credit to RoosterTeeth for the video}

To get this easy first you must build up your Strength skill to the point where you can pick up cars. Once you are strong enough, wait until night and go looking for a HUGE pack of Freaks. Once you find a large enough group pick up the nearest car/truck and hurl it into the crowd (Lock on then press RT). Do this several times until the achievement pops.

Get your strength up a little bit, then just pick up cars and lob them at the freaks - pick a decent spot, and you'll be able to get all 25 in just a handful of throws... (Sadly, throwing grenades doesn't count for this chievo!)