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