You can start an assassination mission by answering one of the ringing phones around the map, answer a phone by pressing F or Enter. You will get a text telling you what your assassination for that specific moment is.
The phone may tell you to:
- Kill a Psychopath
- Kill a police officer
- Kill a gang member
- Kill a criminal
When the phone call is done, a timer will start counting down, this is your time limit to complete the job. If you succeed you will get a crypto currency payout and 150XP