Successfully complete one of the following tasks to get a trophy:

Extinction (Bronze): 100,000 Zombies killed.
Paint The Town Red (Bronze): Fill the screen with the maximum amount of blood on any level.
Red Shirt (Bronze): Kill the away team Zombie.
Hot To Trot (Bronze): Last 30 seconds with 50+ zombies on fire.
Murder On The Dance Floor (Bronze): 1000 Zombies sent dancing.
Brain Surgery (Bronze): 100 Brains sucked.
Texas Style (Bronze): 100 Chainsaw Combos.
Dynami-Te-He (Bronze): 1000 Zombies blown up.
Graduation (Bronze): Complete Zombie Academy.
Tourist (Bronze): All Arcade levels unlocked.
d6 Commends You (Bronze): All Bronze medals.
d6 Respects You (Bronze): All Silver medals.
d6 Admires You (Bronze): All Gold medals.
Friend of Bruce (Silver): All levels unlocked.
Friend of d6 (Gold): All Developer medals.