Finishing moves are performed when successfully pulling off a defensive counter (using the block button), then grabbing a stunned enemy. Once you’ve grabbed a zombie with , you can bludgeon them with attacks using , and, assuming their health is low enough, you’ll execute a brutal finisher, specific to the type of weapon you’re using. Combine this with the I Got a Zombie Army and You Can't Harm Me (10G) achievement to kill two birds with one stone.