Here is the full list of all 35 Postal III achievements.
50 kills using boomerang machete.
100 kills using machete in melee.
Finish your business with Krotchy.
Escape from prison.
300 headshot/decap kills.
Beat game with zero kills.n(zombies and bosses don't count)
Taze 200 victims.
Arrest 200 perps.
Kill no animals in one playthrough.
200 kills using M-60.
Complete Good path without falling off.
Injure yourself.
Complete game killing only males.
Spend 900 seconds or more in catnip bullet time.
Disobey orders, given to you, and see what happens.
Choose path for the first time.
Make Venezuela peacemakers go home.
Return Thegways to the owner
Arrest eco zealots leader.
Take out all the criminal scum infesting Catharsis!
Beat the game once. No restrictions apply. Everyone's a winner.
50 kills using cat.
50 kills using bees.
150 kills using fire.
Kill/incapacitate 235 terrorists.
Piss 100 gallons of urine.
Suck up 500 items with the shop vac.
Complete game using only melee.
Complete game using only the pistol.
Euthanise 30 elderly folks.
Kill 1000 unarmed bystanders.
50 badgersaw kills.
Destroy 50 cars.
Smash 50 windows.
Respawn 20 times.