Unlock all upgrades for a single trap

Complete any Weekly Challenge

Kill 100 enemies

Use bricks or bottles to lure an infected into attacking a human

Win the water gun fight

Win the brick throwing contest

Find all Firefly pendants

Break into every locked door using shivs

Find all training manuals

Pet Buckley the dog

Open all safes

Ride the sewer contraption with Henry and Sam

While in stealth, turn off the spotlight generator in Pittsburgh