Story related; cannot be missed.
*** Spoiler - click to reveal ***What happens here is dependent on whether you spared Max or not earlier. Following his capture, Javi is taken to the council where David is pleading his case. If Max is alive, he will back up David's accusation against Joan, who will persuade everyone else to take her side. If Max is dead, Lonnie will back up David's accusation, but say it was on David's orders.
Either scenario will unlock the achievement after the scene ends.