Here is the full list of all 35 Postal III achievements.
Kill 1000 unarmed bystanders.
Piss 100 gallons of urine.
Escape from prison.
Return Thegways to the owner
Choose path for the first time.
150 kills using fire.
50 kills using bees.
50 badgersaw kills.
Spend 900 seconds or more in catnip bullet time.
Beat the game once. No restrictions apply. Everyone's a winner.
Suck up 500 items with the shop vac.
Finish your business with Krotchy.
Destroy 50 cars.
200 kills using M-60.
50 kills using cat.
300 headshot/decap kills.
50 kills using boomerang machete.
Respawn 20 times.
100 kills using machete in melee.
Disobey orders, given to you, and see what happens.
Injure yourself.
Kill/incapacitate 235 terrorists.
Beat game with zero kills.n(zombies and bosses don't count)
Taze 200 victims.
Arrest 200 perps.
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.
Complete game killing only males.
Smash 50 windows.
Make Venezuela peacemakers go home.
Arrest eco zealots leader.
Take out all the criminal scum infesting Catharsis!