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