S.T.A.L.K.E.R.: Shadow of Chernobyl/Yantar

Main Mission
Head West to the mobile lab. Inside you'll find Professor Sakharov and Professor Kruglov (if you completed the Lead Kruglov to Yantar mission).

Take radiation measurements
Reward: Stone Flower artifact
 * Escort Kruglov outside as he takes readings. He'll head towards the tunnel to the north-east, then through it to the other side of the hill; try to stay ahead of him and deal with any nearby zombie stalkers. Kruglov will make three stops on his way; just before the tunnel, just after, and next to the bus at the other end of the tunnel. At the final spot, he'll warn you of zombies; you'll pass out and shortly after wake up again, inside the bus. Kruglov is still outside, wounded and needing a medikit. Patch him up and escort him back to the lab.

Get inside X16

 * Going back to Sakharov you'll be given a a functional psi-helmet along with a new mission: Get inside the lab. He'll tell you about an associate of his, Vasiliev, that tried to enter the X16 lab along with Ghost not long ago. You can find Vasilievs body near the downed chopper to the west of the mobile lab and the swamp. Once you search his body, you'll receive a recording that shed a little light on what has happened. You will also complete the mission Find out what happened to Ghost. Once you've listened to the recording, head north-east to the gate leading into the X16 compound. The area is also filled with zombies and Snorks. When you've searched the entire place, or you just wish to head on, move into the building near the map marker head down and into X16.

Bring a part of the snork's body
Reward: 2500 RU and a Scientific first aid kit
 * Kill and search snorks until you find the "Snork Foot".

Bring the bloodsucker's jaw
Reward: 6000 RU and a Scientific first aid kit
 * Kill and search bloodsuckers until you find the "Bloodsucker Tentacles".

Bring the eye of a flesh
Reward: 1000 RU and a SUSAT Scope
 * Kill and search flesh's until you find the "Flesh Eye".

Bring the Fireball artifact
Reward: Pellicle artifact
 * There's plenty in the fire-trap tunnel you came through in the Wild Territory to get to Yantar.

Bring the leg of a boar
Reward: 3000 RU and a Scientific first aid kit
 * Kill and search boars until you find the "Boar's Hoof".

Bring the tail of a blind dog
Reward: 2000 RU and 30 12x76 dart rounds
 * Kill and search blind dogs until you find the "Dog Tail", there's plenty when you go back through the Wild Territory after completing the X16 mission.

Bring the unique bodysuit
Reward: SSP-99M Suit
 * Found on the body of "Ghost" inside X16.

Destroy the lair of wild dogs
Reward: 3000 RU and two Scientific first aid kits
 * The lair is in the Wild Territory, kill every dog on the map.

Find the artifact called Sea Urchin
Reward: SEVA Suit
 * A common artifact, should be easier to find in the more rural map areas.

Find the "gravi" artifact
Reward: 5000 RU and a Scientific first aid kit
 * A common artifact, should be easier to find in the more rural map areas.

Find the "Jellyfish" artifact
Reward: 2500 RU and a Scientific first aid kit
 * A common artifact, should be easier to find in the more rural map areas.

Find the "Moonlight" artifact
Reward: 10000 RU and 3 Scientific first aid kits
 * Located at the northern point of the Wild Territory, inside a train station door way.

Purge the lair of the snorks
Reward: 3000 RU and two Scientific first aid kits
 * The lair is in the Yantar swamp, snork in the area.

Artifacts

 * Pellicle: Retrieve the "Fireball" artifact, bring it to "Professor Sakharov" and exchange it for the Pellicle.
 * Burnt Fuzz: Located in the south hangar.
 * Goldfish artifact: On the upper floors of the building with the entrance to X16.

Armour

 * Healing Beril: Located inside the X16 compound on the body marked on the map.
 * Stalker Suit: Located inside the small shed, just south of the entrance to X16.
 * SSP-99M Suit: Retrieve the armour from "Ghost", bring it to "Professor Sakharov" and exchange it for SSP-99M.