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