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