Here is the full list of all 21 Pizza Death achievements.
Successfully complete the first five deliveries!
Purchase the Machine-Gun
Purchase the Mini-Gun
Purchase the Rocket Launcher
Purchase a pizza for yourself
Successfully complete the first ten deliveries!
Survive your shift at work
Unlock a studio track from the album 'Slice of Death'
Unlock the entire 'Slice of Death' album
Listen to a studio track from the 'Slice of Death' album by Pizza Death
Crank your amp volume up to 11!
Kill every different enemy type
Survive your shift in under 10 minutes
Survive your shift without picking up any weapons
Survive your shift without ever taking damage
Survive your shift whilst filling out the entire menu and successfully delivering all the pizzas
Experience every form of death possible
Kill a thousand Cheeslings
Deliver 666 pizzas
Unlock the cheese bridge
..is the greatest game of all time