Here is the full list of all 35 Postal III achievements.
Kill 1000 unarmed bystanders.
Arrest 200 perps.
Destroy 50 cars.
Kill/incapacitate 235 terrorists.
50 badgersaw kills.
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.
Euthanise 30 elderly folks.
50 kills using bees.
Taze 200 victims.
150 kills using fire.
Make Venezuela peacemakers go home.
Beat the game once. No restrictions apply. Everyone's a winner.
Take out all the criminal scum infesting Catharsis!
Arrest eco zealots leader.
200 kills using M-60.
Smash 50 windows.
300 headshot/decap kills.
Finish your business with Krotchy.
Escape from prison.
Return Thegways to the owner
100 kills using machete in melee.
50 kills using boomerang machete.
Choose path for the first time.
50 kills using cat.
Respawn 20 times.
Suck up 500 items with the shop vac.
Spend 900 seconds or more in catnip bullet time.
Piss 100 gallons of urine.
Injure yourself.
Disobey orders, given to you, and see what happens.