Here is the full list of all 35 Postal III achievements.
Kill 1000 unarmed bystanders.
50 badgersaw kills.
50 kills using cat.
150 kills using fire.
Spend 900 seconds or more in catnip bullet time.
Arrest 200 perps.
Complete Good path without falling off.
Make Venezuela peacemakers go home.
Respawn 20 times.
Arrest eco zealots leader.
Take out all the criminal scum infesting Catharsis!
Kill/incapacitate 235 terrorists.
Beat the game once. No restrictions apply. Everyone's a winner.
Finish your business with Krotchy.
Escape from prison.
Choose path for the first time.
Return Thegways to the owner
50 kills using bees.
Injure yourself.
Destroy 50 cars.
Euthanise 30 elderly folks.
Smash 50 windows.
Piss 100 gallons of urine.
300 headshot/decap kills.
200 kills using M-60.
50 kills using boomerang machete.
Taze 200 victims.
100 kills using machete in melee.
Disobey orders, given to you, and see what happens.
Suck up 500 items with the shop vac.
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 game killing only males.