To unlock the "CONFRONTATION" trophy in Detroit: Become Human, you must choose to attack the police at the end of the chapter "FREEDOM MARCH". You will have several opportunities during the standoff to choose whether to disperse, attack or stand your ground, but as soon as you select "Attack" you won't be able to change your mind. This leads to a significant drop in public opinion as well as the potential for Markus or his allies to get killed. You will unlock the trophy when you reach the flowchart.