Complete the game.
Get all the gold medals.
Find Thomas.
Arrive at Dark Swamp.
Arrive in Salt Desert.
Arrive at Lost Desert.
Kill a zombie helmet using the pistol.
Step on 15 Zombie Arms in a single Horde.
Step on 15 zombie heads in a single horde.
Buy all weapons.
Buy all items.
Improve binoculars to the maximum.
Improve your backpack to the fullest.
Improve your belt to the maximum.
Improve the Sniper to the fullest.