http://www.newgrounds.com/portal/view/559997

Four medals worth 25 points total.

It's a movie, so you don't have to do much to get the medals.

Zombie Mode - Watch the movie and the credits to unlock Zombie Mode.
Innocent Bystander - Kill the dog when in Zombie Mode.
Zombies Vanquished - Kill all six zombies.
Animator's Pal - Click on the "share on Facebook" button after the credits have finished rolling.