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