Here is the full list of all 25 Zombie Exodus achievements.
Ending 4 - Hidden Bunker
Leave the cathedral solo.
High humanity.
Low humanity.
High allegiance.
High morale.
Best friend to all.
High dexterity.
High strength.
High intelligence.
High will.
High charisma.
High technical.
True romantic relationship.
Find all hidden weapons.
Ending 1 - The Summit
Ending 2 - BayTown
Ending 3 - New Command
Ending 5 - Become a Zombie
Ending 6 - Become a Raider
Ending 7 - The Chosen
Ending 8 - Develop the Vaccine
Ending 9 - Settle in Temperance
End with all female survivors.
End with all male survivors.