| Unlockable | How to unlock
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| - Earn the Big Boss emblem on a single-player session
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| - Use over 41 continues by the end of the game.
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| - Defeat the Battle Beauty (human form) Crying Wolf by non-lethal means.
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| - Purchase and keep more than 60 different weapons.
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| - Defeat the Battle Beauty Laughing Octopus (the overall battle, no specifics involved).
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| - Defeat the Battle Beauty (human form) Laughing Octopus by non-lethal means.
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| |
| - Shock Dr. Emmerich using the Metal Gear II during the intermission scene.
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| - Defeat the Battle Beauty (human form) Raging Raven by non-lethal means.
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| - Shock Sunny using the Metal Gear II during the intermission scene.
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| - Shock Dr. Naomi Hunter using the Metal Gear II during the intermission scene.
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| - Shock Colonel Campbell using the Metal Gear II during the intermission scene.
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| - Defeat the Battle Beauty (human form) Screaming Mantis by non-lethal means.
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| |
- Young Snake with bandanna
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