Once you are free playing in the Manhattan sub area, certain crimes will occur. There are 3 different types of crimes that I've noticed.
- Armored cars
- Theft
- Bullying
You will either hear screams for help or a voice telling you about a crime that is happening. The crime will be in a short radius of where you are standing at the moment. An icon on your radar should pinpoint you where to go.
These crimes happen all the time, you wont even have to go look for them. Just remember to do all 10 in one single session. If you quit out of the game before you get the achievement you will have to start over. You can leave Manhattan and travel back to continue though.