Here is the full list of all 33 Zarathustra - there are Cybergeddon achievements.
Someone had to tell him!
Get a visit by Anna at the hospital
Shoot the lock in the sewers
Reminisce about the city
Bring the guard a coffee
Re-open the case on Leonard Atura
Buy something at the convenience store
Finish the first day of the game
Finish the second day of the game
Finish the third day of the game
Decipher the encrypted instructions
Get rescued by Fly
Inspect the Gigantuan
Put on the mask
Reach the Inner Sanctuary
Call Jeff to the rescue
Free the King in Yellow
Listen to everything the bishop has to say
Look at those Samosas!
Get the mechanism to work
Find out more about the woman from the church incident
Bring Corso to translate the book
Encourage Ramirez to ask for a raise
Eat Pizza Hawaii
Listen to the poem on Aaron's computer
Get the present from Jeff
Ride to Kingsport
Find the combination for the safe
Look at the sign on McCarthy's pad
Report the incident at the hospital to the security officer
Survive the shootout at the abandoned tracks
Bring Caesar's sister over
Drink the whisky