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