These are all highlighted when using Survival Instinct. He'll tell you to seek out the outcasts, four of which are market, while the fifth is revealed after speaking to the other four.
Follow the quest marker to the south west of the city to find the banished man. You'll be asked to retrieve dice from a 'dead man'. Talk to the boy sitting at the foot of the hill near the market square. Enter the crypt worksite and defeat all the pillagers, then return to Marco to receive the River Hawk pistol. Marco informs you that his son is forced to work for the slavers and to head to the edge of town in order to save them. Talk to him, then talk to Omar who tells you to talk to Marco. For all you need to know on skill points, as well as some other tips and tricks for the game, go to our Shadow of the Tomb Raider guide. While some unlock new gear for you to use in your adventure, others just grant you experience that eventually grants you skill points to upgrade Lara's abilities. The vast majority of the quests you'll receive come from The Hidden City. Shadow of the Tomb Raider Side missions and challenges guide