Build all available combo weapons.
Spend $100,000 in the pawnshop.
Find and return a bike part.
Purchase a clue from Dick, the pawnshop owner.
Build a combo weapon.
Kill 1,000 zombies.
Kill 100 zombies.
Save all the survivors in Still Creek.
Escape Still Creek with Katey.
Defeat Jed the Mechanic.
Rebuild the bike.
Unlock all the doors in Still Creek.