You can get this on the city level as soon as you enter the supermarket and thugs attack you. I suggest doing this on normal or hard because there are more enemies. There is a shopping cart in the middle you can running attack
from either side. After beating them send the cart to the right side before proceeding. Here you will find another cart in the middle of the aisle and you can use both of them to defeat the thugs. More will come from behind. They should be more than enough.