Unlockable: | How to Unlock: |
Bandanna | Complete a single-player session without killing anyone (including bosses). You can do this on any difficulty |
Desert Eagle, Long Barrel | Earn the Fox emblem on a single-player session |
Digital Camera | In the Nomad vehicle during the mission intermission; you can unlock a special photo by picking up this item in stage 4 instead of earlier |
Patriot Future Assault Weapon | Earn the Big Boss emblem on a single-player session |
Race (Ricochet) Gun | Clear the single-player game once |
Scanning Plug S | Log more than 10 hours of Metal Gear Online play time on the same profile as your Metal Gear 4 game. You purchase this from Drebin |
Solar Gun | Collect the five statues (those of the four Battle Beauties and the Frog Soldier/Haven Troopers in stage 1) using non-lethal means on their respective idols |
Stealth Item | Complete a single-player session without instigating a single alert (caution is okay, but not alert). You can do this on any difficulty |
Thor 45-70 | Earn the Fox Hound emblem on a single-player session |
World War I Pistol | Earn the Hound emblem on a single-player session |
Unlockable: | How to Unlock: |
Big Boss's | Earn the Big Boss emblem on a single-player session |
Crying Wolf | Defeat the Battle Beauty (human form) Crying Wolf by non-lethal means. |
Drebin | Purchase and keep more than 60 different weapons. |
FaceCamo | Defeat the Battle Beauty Laughing Octopus (the overall battle, no specifics involved). |
Laughing Octopus | Defeat the Battle Beauty (human form) Laughing Octopus by non-lethal means. |
Otacon | Shock Dr. Emmerich using the Metal Gear II during the intermission scene. |
Raging Raven | Defeat the Battle Beauty (human form) Raging Raven by non-lethal means. |
Raiden Mask A | Shock Sunny using the Metal Gear II during the intermission scene. |
Raiden Mask B | Shock Dr. Naomi Hunter using the Metal Gear II during the intermission scene. |
Roy Campbell | Shock Colonel Campbell using the Metal Gear II during the intermission scene. |
Screaming Mantis | Defeat the Battle Beauty (human form) Screaming Mantis by non-lethal means. |
Unlockable: | How to Unlock: |
Beyond the Bounds (increases stun damage done by Snake from non-lethal weapons) | Stage 4 Shadow Moses, Tank Hangar. After power is restored, backtrack to the upper catwalk and explore all rooms |
Big Boss (increase stun damage and increases Snake's accuracy when played) | Earn the Big Boss emblem |
Bio-hazard (cause soldiers held by Snake to scream in terror) | Stage 3 Europe, Midtown |
Destiny's Call (cause soldiers held by Snake to go enraged) | A random gift from a militia or rebel soldier if Snake gives them a healing item |
Flowing Destiny (cause soldiers held by Snake to weep like a little girl) | Stage 4 Shadow Moses, Canyon. Before leaving the canyon area, examine the rocky walls for a hole hiding this item |
Fury, The (cause soldiers held by Snake to go enraged) | Stage 2 South America, Cove Valley Village. Inside the fire ravaged house |
MGS 4 Love Theme / Action (cause soldiers held by Snake to weep like a little girl) | A random gift from a militia or rebel soldier if Snake gives them a healing item |
Opening - Old L.A. 2040 (increase Snake's accuracy) | Stage 4 Shadow Moses, Nuclear Warhead Storage B2. Input 78925 into Otacon's lab computer |
Policenaughts Ending (cause soldiers held by Snake to fall asleep on touch) | Stage 4 Shadow Moses, Nuclear Warhead Storage B2. Input 13462 into Otacon's lab computer |
Rock Me (increases Snake's amount of life recovered from items and other means) | Stage 2 South America, Confinement Facility. Island in the south-eastern quadrant |
Sailor (increases Snake's amount of life recovered from items and other means) | Stage 2 South America, Vista Mansion. Between the east wall and a cargo container |
Show Time (cause soldiers held by Snake to scream in terror) | A random gift from a militia or rebel soldier if Snake gives them a healing item |
Snake Eater (increase the life recovery rate of Snake through items and other actions) | Unlocked by earning all 40 game clear emblems |
Subsistence (increase Snake's accuracy) | Play at least one game of Metal Gear Online. You must start the match with at least two players |