After surviving three emissions, if you are in good health you can survive emissions without the aid of Anabolics due to the effects of using the drugs.
Easy "Man Of Balance", "Friend Of Duty", and "Friend Of Freedom" achievements: Although some believe that you cannot complete the Monolith fighters quest or Guarding the Bunker without having the "Friend Of..." achievement for either faction, this is not true. Flint, Magpie, or Soroka must be turned into the appropriate faction you want to be friends with, but not get the achievement. This allows you to have that faction guard the scientist bunker, and recruit the Monolith fighters as well. The faction you wish to assign those tasks to must simply have green (friendly) status towards you. If you still want to get the "Man Of Balance" achievement, tell whoever about Flint, then sell the two required PDAs for either faction to Owl. You can still tell Gaunt about Flint. All this can be done without missing any quests and you will still get your discounts from the Yanov merchants.
ACHIEVEMENT - HOW TO UNLOCK Battle Systems Master - Bring Cardan all three toolsets. Courier of Justice - Complete the Magpie/Flint/Soroka quest line. Diplomat - Solve Mitay and Vano's quest lines without killing the bandits. Detective - Complete the Missing Stalkers quest line. Friend of Stalkers - Complete all Stalker related quests, including those required for One of the Lads. Friend of Freedom - Tell Loki about Flint and give General Tachenko's and Morgan's PDA to him. Friend of Duty - Tell Shulga about Flint and give General Tachenko's and Morgan's PDA to him. High Tech Master - Bring Nitro all three toolsets. Keeper of Secrets - Give any information concerning Strelok to him. Kingpin (Unconfirmed) - Complete Stalker quests in favor of Sultan. Leadership - Recruit a full squad including, Zulu, Strider, Vanov, and Sokolov for the Pripyat Underground Mission. Marked by Zone - Survive three blowouts using Experimental Anabolic drugs. Man of Balance - Sell General Tachenko's and Morgan's PDA to Owl. Mutant Hunter - Complete all the mutant related quests given by Gaunt and Trapper. This includes Bloodsucker Lair, Bloodsuckers in the Swamp, Unknown Mutant Den (Burers), Wounded Chimera, and Nocturnal Chimera. One of the Lads - Complete Yanov and Skadovsk Quest lines in favor of Stalker faction. Pioneer - Plant scanners in all anomalies and complete the Rotten Grove quest. Research Assistant - Complete all Scientists quests and deliver Oasis to them. Artifact Hunter - Collect one of each artifact in the game, this includes, compass, oasis, wheel, and spiral. Seasoned Stalker - Visit every anomaly in the game, and certain points of interest. Trafficker of Information - Sell Owl any 9 pieces of information. Wealthy - Collect 100,000 RU during the course of the game.
Once technicians are friendly to you through quests, you can repair items for cheaper. If you bring back all the weapons and items you loot from ten people, you can repair, break them down (silencers and scopes), unload, and sell the ammo, weapons, and attachments for more money.
The ending is determined by actions you took throughout the game. Each action unlocks an extra sequence of the ending you normally would not see.
1. Complete the "Battle Systems Master" achievement. 2. Complete the "Courier Of Justice" achievement. 3. Complete the "Detective" achievement. 4. Complete the "Friend Of Stalkers" achievement. Prevents ending #8. 5. Complete the "Friend Of Duty" achievement. Prevents endings #6 and #9. 6. Complete the "Friend Of Freedom" achievement. Prevents endings #5 and #9. 7. Complete the "High Tech Master" achievement. 8. Complete the "Kingpin" achievement. Prevents ending #4. 9. Complete the "Man Of Balance" achievement. Prevents endings #5 and #6. 10. Complete the "Mutant Hunter" achievement. 11. Complete the "One Of The Lads" achievement. 12. Complete the "Pioneer" and "Research Assistant" achievements. 13. Complete the "Trafficker Of Information" achievement. 14. Complete the "Battle Systems Master" achievement but not the "High Tech Master" achievement. 15. Complete the "High Tech Master" achievement but not the "Battle Systems Master" achievement. 16. Do not kill Noah. 17. Vano survives. 18. Zulu survives. 19. Strider survives 20. Strelock survives. 21. Finding out about the fate of Barge and Joker for Cardan. Allows the combination sequence for ending #1 and #7. 22. Find all six documents in the X8 Lab. 23. Restore the Gauss Rifle to operational. Changes the combination sequence for ending #1 and #7 to the best outcome. 24. Find the Compass artifact for Beard. 25. Leave on the choppers at end of game. 26. Do not leave on the choppers. Prevents endings #1 through #25.
When you first start the game, go to the burnt farmstead. There is a burnt piece of wood leaning against the wall of the ruined house on the top right. Walk up it and you can follow the roofs to the left to get a Vintar laying on the roof of the building on the far left.
While making your first trip through the Bloodsucker's lair, you exit through a tunnel. If you follow the tunnel the other way, there is a stash containing Anabolic drugs, which are the earliest ones you can find.
Located at the northwest corner of the Jupiter Map is a UAV crash, in a crater. You can loot the computer and have Nitro decrypt it for you. It gives you the locations of the three stashes containing Strelok's notes that can be used to complete the "Keeper of Secrets" achievements and also to acquire Strelok Lucky SGI5K, which is arguably the best AR in the game because it can hold a silencer, m203, and all Susat scope models.