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