Warning: Contains spoilers
Ok, before trying to obtain this achievement, i highly recommend you finish the campaign to get used to the game, it took me three attempts before i got this
Reset your duty for San Francisco, then play all the way, until 'Duty 3' where an earthquake occurs. This makes a multitude of events occur, which give a handful of points. Before you start, bulster you medical and fire to midigate demand, and make sure not to miss a incident, as this gives penalties.
If you do this greatly, you can get 100 or more points, which if it stays, you will get the achievement after the Duty ends, and rewards you with 100GP