| Unlockable |
How to Unlock |
| 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. |
| Raging Raven |
Defeat the Battle Beauty (human form) Raging Raven by non-lethal means. |
| Crying Wolf |
Defeat the Battle Beauty (human form) Crying Wolf by non-lethal means. |
| Screaming Mantis |
Defeat the Battle Beauty (human form) Screaming Mantis by non-lethal means. |
| Roy Campbell |
Ram Colonel Campbell using the Metal Gear II during the intermission scene. |
| Otacon |
Ram Dr. Emmerich using the Metal Gear II during the intermission scene. |
| Raiden Mask A |
Ram Sunny using the Metal Gear II during the intermission scene. |
| Raiden Mask B |
Ram Dr. Naomi Hunter using the Metal Gear II during the intermission scene. |
| Drebin |
Purchase and keep more than 60 different weapons. |
| Big Boss's |
Earn the Big Boss emblem on a single-player session |
| Young Snake |
Beat Act 2 |
| Young Snake with Bandana |
Beat Act 2 |
| Classic MGS Snake |
Beat Act 3 |
| 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 |
| Boktai 2 Theme |
Act 2, Mission Briefing, upstairs in the Nomad |
| Bon Dance |
Act 2, Marketplace |
| Inorino Uta |
Act 1, Mission Briefing |
| Level 3 Warning |
Act 1, Advent Palace |
| Lunar Knights Main Theme |
Act 4, Mission Briefing, upstairs in the Nomad |
| Metal Gear 20 Years History: Part 2 |
Act 4, Warhead Storage Building B2 |
| Metal Gear 20 Years History: Part 3 |
Act 2, South America Confinement Facility. In room with beds inside the house |
| Metal Gear Solid Main Theme (The Document Remix) |
Act 5, Under hatch to the left at the beginning of area |
| On Alert |
Act 3, Midtown N Sector |
| One Night in Neo Kobe City (Causes soldiers held by Snake to laugh) |
Act 3, Midtown, hold-up PMC. |
| Shin Bokura no Taiyou Theme |
Act 3, Mission Briefing, upstairs in the Nomad |
| Test Subject's Duality |
Act 3, Midtown S Sector |
| The Best Is Yet To Come |
Act 4, Snow Field. Just before the "Disc Change" Codec scene. |
| The Essence of Vince |
Act 3, Echo's Beacon |
| The Fury |
Act 2, in the Cave Valley Village in badly burned building |
| Theme of Solid Snake |
Act 1, Millennium Park |
| Theme Of Tara |
Act 1, Militia Safehouse. Just before seeing the unmanned flying-bomber on the table |
| Warhead Storage |
Act 4, Tank Hanger. Upper floor ventilation shaft. |
| Yell (Dead Cell) |
Act 4, Casting Facility North |
| Zanzibarland Breeze |
Act 1, Urban Ruins before cutscene |
| Bio Hazard |
Frisk the restance fighter in Easter Europe. |
| Unlockable |
How to Unlock |
| Rail Gun |
Beat Crying Wolf |
| MGL-140 Grenade Launcer |
Beat Raging Raven |
| Mantis and Sorrow Dolls |
Beat Screaming Mantis |
| Mk. 23 Handgun |
Found in the first area of Act 4 |
| Patriot Future Assault Weapon |
Earn the Big Boss emblem on a single-player session |
| Thor 45-70 |
Earn the Fox Hound emblem on a single-player session |
| Desert Eagle, Long Barrel |
Earn the Fox emblem on a single-player session |
| World War I Pistol |
Earn the Hound emblem on a single-player session |
| Race (Ricochet) Gun |
Clear the single-player game once |
| 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 |
| 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 |
| 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 |
| 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 |
| Bandanna |
Complete a single-player session without killing anyone (including bosses). You can do this on any difficulty |
Be sure to save your cleared data upon game completion to track your items. Load the cleared data to reap your benefits.
Show Me Your Motions
When a character is introduced for the first time, press R2 to view that characters motion capture person instead of that person's voice actor.
Refill Psyche During Cut-scenes
If during a cut-scene something causes Snakes psyche gauge to decrease just press X rapidly to replenish it.
Cheaper Prices In Drebin's Store
Set the PS3 system date to a Wednesday or Sunday, and Drebin will have cheaper prices. Also, in Act 5 all prices are halfed.
