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