List of Peace Walker missions

Unlike other Metal Gear games, Metal Gear Solid: Peace Walker divides gameplay into individual missions (or "ops"), each with its own difficulty level and objectives. Upon completing a mission, an evaluation based on time, ranking, and other relevant stats like alerts/kills is granted and the game auto-saves (with progress at Mother Base updated after finishing).

Completing missions is necessary to advance the story and unlocking new Extra Ops. Occasionally, a bonus reward is given upon completing a mission (or for obtaining S rank). While most allow any character to be used, some can only be done with Snake, while others can only be done with MSF soldiers.

Main Ops
Main Ops cover the main storyline of Peace Walker, and are divided into five chapters. Each can freely be replayed again later, and some contain hidden rewards that may not be initially accessible.

Prologue: An Army Without Borders
Opening/Investigate the Supply Facility Infiltrate the supply facility at Puerto del Alba, the coastal port where Paz was imprisoned, and obtain intel on the bases of the armed group occupying Costa Rica.
 * Starting Location: Barranquilla Coast, Columbia / MSF Base
 * Difficulty: 1 skull
 * Maximum Players: 1
 * Snake only
 * Unlocks: Mother Base
 * Rewards:

Chapter 1: A Country Without An Army
Contact the Sandinista Comandante Delve into the swampy jungles of Eastern Limón and make your way to the Sandinista hideout, where you will make contact with their Comandante.
 * Starting Location: Eastern Limón, Costa Rica / El Cenagal: Jungle
 * Difficulty: 1 skull
 * Maximum Players: 2
 * Unlocks:
 * Rewards: M1911A1, LAW

Pursue Amanda Track and locate Amanda, the Sandinista leader and obtain intel on the enemy's bases and the route used to transport the nuclear material.
 * Starting Location: Eastern Limón, Costa Rica / Rio del Jade
 * Difficulty: 1 skull
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Armored Vehicle Battle: LAV-Type G Neutralize the attacking enemy armored vehicle and make contact with Amanda.
 * Starting Location: Eastern Limón, Costa Rica / Bananal Fruta del Oro: Farm
 * Difficulty: 2 skulls
 * Maximum Players: 4
 * Unlocks:
 * Rewards: LAV-Type G, recruit Amanda

Rescue Chico Rescue Chico from the Aldea Los Despiertos Prison Facility and locate the route used by the U.S. mercenaries to transport the nuclear material.
 * Starting Location: Volcán Irazú, Costa Rica / Camino de Lava: Hillside
 * Difficulty: 2 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards: Recruit Chico

Pursue the Jungle Train Proceed immediately to the jungle train terminal located at El Cadaso, and stop the nuclear shipment before it reaches the enemy's main base in Volcán Irazú.
 * Starting Location: Volcán Irazú, Costa Rica / Aldea Los Despiertos
 * Difficulty: 2 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Tank Battle: T-72U Neutralize the enemy tank standing between you and the nuclear warheads.
 * Starting Location: Volcán Irazú, Costa Rica / El Cadaso
 * Difficulty: 3 skulls
 * Maximum Players: 4
 * Unlocks:
 * Rewards: Mosin Nagant

Destroy the Barricade The truck carrying the nuclear warheads was last seen heading toward Volcán Irazú. The bridge North of the prison facility is the only way to get there, and a barricade blocks your path. Destroy it with C4.
 * Starting Location: Volcán Irazú, Costa Rica / Cafetal Aroma Encantado: Mill
 * Difficulty: 2 skulls
 * Maximum Players: 2
 * Weapons Needed: C4 charges
 * Unlocks:
 * Rewards:

Infiltrate the Crater Base Follow the nukes and infiltrate the enemy's main base inside the Crater of Irazú.
 * Starting Location: Volcán Irazú, Costa Rica / Los Cantos: Canyon
 * Difficulty: 2 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Pupa Battle Stop the enemy's Pupa weapon in its tracks.
 * Starting Location: Volcán Irazú, Costa Rica / Crater Base
 * Difficulty: 3 skulls
 * Maximum Players: 4
 * Unlocks:
 * Rewards: Chaff Grenade documents, recruit Huey

Chapter 2: The Phantom Hero
Travel to the Cloud Forest Head North toward Central Heredia, where Dr. Strangelove's lab lies hidden among Mayan Ruins.
 * Starting Location: Central Heredia, Costa Rica / Selva de la Leche: Jungle
 * Difficulty: 2 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Attack Chopper Battle: Mi-24A Neutralize the enemy attack chopper.
 * Starting Location: Central Heredia, Costa Rica / Catarata de la Muerte
 * Difficulty: 3 skulls
 * Maximum Players: 4
 * Unlocks:
 * Rewards: Sneaking Suit, FIM-43

Head for the Lab Head North to Dr. Strangelove's lab, disguised as a Mayan Ruin.
 * Starting Location: Central Heredia, Costa Rica / Catarata de la Muerte
 * Difficulty: 2 skulls
 * Maximum Players: 2
 * Items Needed: ID Card (H)
 * Unlocks:
 * Rewards: Recruit Cecile

Locate the ID Card Locate the soldier carrying the ID card and steal it.
 * Starting Location: Central Heredia, Costa Rica / Ruinas de Xochiquetzal
 * Difficulty: 3 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Chrysalis Battle Take out enemy's Chrysalis weapon.
 * Starting Location: Central Heredia, Costa Rica / AI Laboratory
 * Difficulty: 3 skulls
 * Maximum Players: 4
 * Unlocks:
 * Rewards: Air Strike Marker

Chapter 3: A Nation Reborn
Travel to the Mine Base Head for the enemy's Mine Base and prevent the assembly of the Mammal Pod and Peace Walker.
 * Starting Location: Mine Base, Costa Rica / Miners' Residence
 * Difficulty: 2 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Eliminate the Guards Eliminate the enemy guards to clear the way for the infiltration of the Mine Base.
 * Starting Location: Mine Base, Costa Rica / Mining Pit
 * Difficulty: 3 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Cocoon Battle The enemy's Cocoon weapon blocks the way into the base. Get rid of it.
 * Starting Location: Mine Base, Costa Rica / Mining Pit
 * Difficulty: 4 skulls
 * Maximum Players: 3
 * Unlocks:
 * Rewards:

Infiltrate the Underground Base Make your way to the bottom of the Underground Base and stop Peace Walker before it is complete.
 * Starting Location: Mine Base, Costa Rica / AI Weapon Hangar
 * Difficulty: 2 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Torture Chamber Escape Escape from the Torture Chamber.
 * Starting Location: Mine Base, Costa Rica / Torture Chamber
 * Difficulty: 3 skulls
 * Maximum Players: 2
 * Snake only
 * Unlocks:
 * Rewards:

Cocoon Battle The enemy's Cocoon weapon blocks the way into the base. Get rid of it.
 * Starting Location: Mine Base, Costa Rica / Mining Pit
 * Difficulty: 4 skulls
 * Maximum Players: 3
 * Unlocks:
 * Rewards:

Peace Walker Battle Stop Peace Walker!
 * Starting Location: Mine Base, Costa Rica / Mining Pit
 * Difficulty: 4 skulls
 * Maximum Players: 4
 * Unlocks:
 * Rewards: Battle Dress

Chapter 4: The Illusion of Peace
Infiltrate the U.S. Missile Base Peace Walker must be stopped before it can launch its nukes. Infiltrate the U.S. Missile base on the Southeastern shore of Lago Cocibolca and head for the Communications Tower.
 * Starting Location: U.S. Missile Base, Nicaragua / Back Gate
 * Difficulty: 3 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Head to the Control Tower Proceed immediately to the Control Tower and stop Peace Walker from launching its nukes.
 * Starting Location: U.S. Missile Base, Nicaragua / Rooftop
 * Difficulty: 3 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Peace Walker Battle 2 Stop Peace Walker from launching its nukes and gain control pf the platform!
 * Starting Location: U.S. Missile Base, Nicaragua / Runway
 * Difficulty: 4 skulls
 * Maximum Players: 4
 * Unlocks:
 * Rewards:

Peace Walker Battle 3 Prevent all-out Nuclear War!
 * Starting Location: U.S. Missile Base, Nicaragua / Runway
 * Difficulty: 4 skulls
 * Maximum Players: 4
 * Unlocks:
 * Rewards: Tuxedo, recruit Paz and Strangelove

Chapter 5: Outer Heaven
Zadornov Search Mission Zadornov has escaped from Mother Base. Find him and bring him back.
 * Starting Location: Eastern Limón, Costa Rica / El Cenagal: Jungle
 * Difficulty: 2 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Zadornov Search Mission 2 Zadornov has escaped from Mother Base again. Find him and bring him back.
 * Starting Location: Carribean Coast, Costa Rica / Bosque de Alba
 * Difficulty: 2 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Zadornov Search Mission 3 Zadornov has escaped from Mother Base once again. Find him and bring him back.
 * Starting Location: Central Heredia, Costa Rica / Selva de la Leche: Jungle
 * Difficulty: 3 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Zadornov Search Mission 4 Zadornov has escaped from Mother Base yet again. Find him and bring him back.
 * Starting Location: Volcán Irazú, Costa Rica / Camino de Lava: Hillside
 * Difficulty: 3 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Zadornov Search Mission 5 Believe it or not, Zadornov has escaped from Mother Base again. Find him and bring him back.
 * Starting Location: Volcán Irazú, Costa Rica / Aldea Los Despiertos
 * Difficulty: 3 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

Zadornov Search Mission 6 You guessed it - Zadornov has escaped from Mother Base again. Find him and bring him back.
 * Starting Location: Mine Base, Costa Rica / Miners' Residence
 * Difficulty: 3 skulls
 * Maximum Players: 2
 * Unlocks:
 * Rewards:

ZEKE Battle Paz has taken control of Metal Gear ZEKE. Stop her from launching the nuke and get ZEKE back.
 * Starting Location: Mother Base / Deck
 * Difficulty: 5 skulls
 * Maximum Players: 4
 * Prerequisites: Complete Metal Gear ZEKE and find Zadornov in the Shooting Range
 * Unlocks:
 * Rewards: Stealth Gun documents