Episode 1: Back to School
Roughly 15 minutes into this episode you will be on a rooftop after a cutscene. You now have to use your scanner to tag a guy in the courtyard. After he has been talking to the other guards you can use the scanner to tag everyone else. There are a total of 9 people in the house in front of you (2 in front of the house, 3 in the first floor on the right, 3 in the second floor on the left, 1 in the second floor on the right) + the 1 you already tagged in the courtyard. This makes 10 enemies with blue tags in total.

More enemies will arrive in cars. There are a total of 9 enemies in the cars that you have to tag. 4 in the small car and 5 in the van. The enemies in the cars will be marked in red color. After tagging all 10 blue and 9 red enemies you will receive the trophy / achievement.