To get this achievement you are going to need to recruit a Street Artist/Artist/Illustrator/Muralist. Either one of them will do because they have a paintball gun. If you happen to stumble upon anyone that doesn't fit that job title but still has a paintball gun that'll do aswell (I have a novelist with a paintball gun). Just go around holding
to find out their job titles. Then hold
to start recruiting them.
Once you have recruited that person, go to any red area in Islington & Hackney as most of them are occupied by Clan Kelley. When you hover over it on the map it should say "Uniformed Access for: Clan Kelley." When you arrive just simply go to 5 different
people in that red area and shoot them in head as that stuns them.
Once you stun 5 of them, the 30G is yours.
Please leave comments/replies if I did anything wrong. Feedback is appreciated :)