Here is the full list of all 23 Z-End achievements.
Well played! You've met Cliff.
Well played! You've met a looter.
Well played! You've reached the residential area.
Well played! You've met Tim.
Wow! Faye just turned into a zombie!
Well played! You've reached the park.
Well played! You've reached the campus.
Well played! You've met Joanne.
Well played! You've reached the police station.
Well played! You've reached the mall.
Well played! You've reached the hospital.
Well played! You've reached the business quarter.
Well played! You've met Caïn.
Well played! You've reached the avenue.
Well played! You've reached the wasteland.
Well played! You've reached the highway.
Well played! You've used the radio.
Well played! You've reached the end.
Well played! You've met a child.
Well played! You've met Faye.
Well played! You've reached the gas station.
Well played! You've rewinded the story.