Here is the full list of all 14 Pew Paw achievements.
Destroy all tombstones in town.
Pick up the first aid kit.
Blow up the barrel next to the zombies.
Reach rank 20.
Reach rank 10.
Reach rank 5.
Kill the boss 10 times.
Poison a zombie with a blast.
Defeat the king.
Kill the Death.
Get 5 suits.
Die 10 times.
Get the triple fire bullets.
Blow up 15 barrels.