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