Here is the full list of all 20 24 Hours 'til Rescue achievements.
You have attempted to survive the apocalypse as Denise Overdean
You have attempted to survive the apocalypse as Sara Kiplingsworth
You have attempted to survive the apocalypse as Mathew Finedecker
You have attempted to survive the apocalypse as Roger Grubberwick
You have attempted to survive the apocalypse as Hannah Greatford
You have attempted to survive the apocalypse as Clive Mackersdonger
You have attempted to survive the apocalypse as Joan Dartsmith
You have attempted to survive the apocalypse as Alice Wazcheck
You have attempted to survive the apocalypse as Craig Fastbender
You have attempted to survive the apocalypse as Patrick Alpanda
You have contacted the military for evacuation!
You have collected sample data from patient zero in the hope of finding a cure.
You have turned on the city's broadband.
You have deactivated the city's AA defences so that rescue can arrive!
You have killed patient zero before they could attain critical mass.
You have escaped the city with the sample data, and saved the world!
You've scored over 250 points in one game.
You've scored over 500 points in one game.
You've scored over 750 points in one game.
You've scored over 1000 points in one game.