To unlock this achievement, you have to destroy every:

• tree
  
• lamppost
  
• mailbox
  
• stop sign
  
• fire hydrant

Every object makes an explosion effect when destroyed.

You have to run at them in slowmotion mode at a very fast speed.
For that you must have your Cat Reflexes (Slowmotion Ability) in order to take advantage of it.
You also must have the highest Speed you can get.
You can put Catpacity at it's lowest, it doesn't matter for this achievement.
To edit your stats, go the this station on your house:



Then chose the following stats:




Then start a game and try to use the slowmotion ability (with space or Q) when your near an object and run past them in order to explode them.
Also don't forget to pick up blue cats (2 at a time, since you catpacity is low) and deposit them in your house, since they will give you more slowmotion time.
Try managing your slowmotion time so you don't waste much and you'll eventually destroy everything, just like in Postal 2.

Thank you for reading.
Hope this guide helped you get this one tricky achievement.

If you want, don't forget to favourite/award.
And please comment if you have any doubts

Good luck :)