Immediately upon entering the location, in the forest, grab 3 bundles of firewood and look (with binoculars) at the torn woman in the right part of the forest (this is necessary for the quest with the shaman, otherwise the ghost will not appear).
Collect weapons for the tribe's warriors. 300 XP
Bring the main warrior 10 ordinary knives and 5 ordinary spears to make him happy and open other quests in the Primitive Tribe location.
In MM version 2.47+, this opening quest is missing. It has been replaced with another one, in which you need to expose a greedy merchant trying to sell a crate of Stimpaks to the tribals.
Fix the well for Marley and the tribe. 400xp
Talk to the warrior standing by the well; he'll tell you it's broken. Use the rope from your inventory on the well. After talking again, you'll learn the job isn't finished yet (of course!): you need to pick up the bucket (it looks like a pot) standing by the well and use it in the same way to complete the task.
Find out what's bothering the tribe's shaman. 500xp
Talk to the shaman to learn he's being haunted. At midnight, the ghost of the murdered girl (the one in the forest) will appear near his hut. Talk to the ghost and agree to help. Talk to the shaman again, and he'll perform a ceremony to release her spirit.
In MM 2.47+ this quest is slightly changed, and the ghost appears in the forest, next to a mutilated corpse.
After successfully completing this quest, approach the tribe's chief warrior. He'll ask you to find the missing hunters. To do this, go to the seashore. There's a cave there, containing a gecko attempting to devour a surviving hunter. Kill the gecko. After speaking with this hunter, you'll automatically be transported to the shaman's hut. The injured hunter sleeps deep in the hut, and the shaman asks you to bring him five broc flowers and three zander roots for healing (they can't be found in the nearby forest; you need to stock up in advance in Arroyo). Give the flowers to the shaman, and all is well.
Reunite Sulik and his sister Kurisu.
Once you've done a good deed or two for the tribe, talk to the warrior guarding the tent. The tribe elder is inside. If you ask him about Sulik's sister (Sulik should be in the party), the elder will tell you that she was taken by slave traders and name Metzger.
Speak with Metzger in The Hole, and he'll point out the location of the slaver camp on the map near Kollyweb (Speech 61%). Freed slaves will also point to it if Metzger is dead. Kill the camp guards, take the key from their leader's corpse, open the door to the house on the right, and free Sulik's sister. Apparently, there's a peaceful way to free him, as you can convince the head guard to give you the key to the slave cages. Afterwards, you'll be teleported to Sulik's village and Kurisu. Be sure to speak with Sulik after completing the quest, otherwise he'll remain there. If you return to the slaver camp, a clone of Sulik's sister will be standing in the cage, thanking you for freeing him. Metzger in The Hole won't become hostile to you after you defeat the camp.
Bring 3 bundles of firewood from the forest to the woman in the hut on the coast. 200 xp
Source: falloutmods.fandom.com.