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The ending is determined by actions you took over the course of 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.
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.