There are 12 achievements worth a total of 200 points
Build a combo weapon.
Kill 100 zombies.
Kill 1,000 zombies.
Spend $100,000 in the pawnshop.
Escape Still Creek with Katey.
Save all the survivors in Still Creek.
Rebuild the bike.
Unlock all the doors in Still Creek.
Build all available combo weapons.
Defeat Jed the Mechanic.
Find and return a bike part.
Purchase a clue from Dick, the pawnshop owner.