Here is the full list of all 30 Pixel Puzzles: UndeadZ achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Zombie Hunter
Hell's For The Homeless
Kill 100 Menu Zoms
Kill 50 Menu Zoms
Don't Smoke
Chewy Dogz
Blow 'Em Up
You'z Got Bit
Some Tongue?
Trip 'Em
Hard Ass Hooker
Survive 15 Minutes In Menu
kill 500 Menu Zoms
Zombie Slayer
Zombinator
Zombliterator
The Beauty Of Birth
Underground
Tea Party
Hawk Eye
Prep For Bravery
Dead Monk
Shekly Shot Eye
What's On Tv?
The Bride
Undeadz 4 Lyfe Yo
Killer Clown
Back To Back
Rasta Gonna Get Ya!
No Where To Run