Reach rank 20.
Reach rank 10.
Reach rank 5.
Pick up the first aid kit.
Destroy all tombstones in town.
Kill the boss 10 times.
Poison a zombie with a blast.
Blow up the barrel next to the zombies.
Defeat the king.
Kill the Death.
Get 5 suits.
Die 10 times.
Get the triple fire bullets.
Blow up 15 barrels.