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