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