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