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