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Mass Effect Wiki
Disambiguous This article is about Mass Effect 3. For a walkthrough of the first game, see Mass Effect Guide. For a walkthrough of Mass Effect 2, see Mass Effect 2 Guide. For a walkthrough of Mass Effect: Andromeda, see Mass Effect: Andromeda Guide.

This page contains a walkthrough for the main missions of Mass Effect 3. Major changes in the gameplay from Mass Effect 2 are listed in the main Mass Effect 3 page, while the effects of importing a saved game from Mass Effect 2 are listed in the Save File Transfer page. For a comprehensive introduction to the mechanics of the actual fighting the player must engage in on most missions, see the combat page.

Legendary Edition: All content that was previously available only from Downloadable Content (DLC) is now included by default, but overall requirements and prerequisites for the missions and characters only available from DLC in the original game remain largely the same. Legendary Edition does feature many changes to the original Mass Effect 3, including changes to how certain equipment is obtained.


Main Plot[]

For a summary of when various NPC allies become available to join Shepard's crew and an overview of their capabilities, see Squad Members Guide (Mass Effect 3).

The following missions represent plot progression. They have no time limit, but each mission must be completed before the next becomes available.

Prologue[]

Act I[]

Act II[]

Act III[]

Note: No side missions can be completed once you begin Act III, so finish up anything else you want to finish before heading to Cerberus Headquarters.

Side Missions[]

These missions are issued or can be acquired as the game progresses. They are sorted according to the Priority mission after which they become available. The opportunity to complete certain side missions expires once specific main plot missions are completed. Others are marked as failed if not completed before a number of other missions are completed. These missions are noted below as "progress-sensitive missions" and "timed missions" respectively. Be aware that any side missions not completed before the main plot mission Priority: Cerberus Headquarters will no longer be accessible for the remainder of the game.

Note: Italicized mission names denote minor missions which can be completed merely through planet scanning, conversations, or finding an item during another mission.

Priority: The Citadel I[]

Priority: Palaven[]

Priority: Sur'Kesh[]

Priority: Tuchanka[]

Priority: The Citadel II[]

Priority: Geth Dreadnought[]

  • N7: Fuel Reactors
  • Rannoch: Admiral Koris
    • Main Plot Progression: Unlocks the main plot mission Priority: Rannoch.
    • Progress-Sensitive Mission: This mission expires if not completed before Priority: Rannoch.
  • Rannoch: Geth Fighter Squadrons
    • Main Plot Progression: Unlocks the main plot mission Priority: Rannoch.
    • Progress-Sensitive Mission: This mission expires if not completed before Priority: Rannoch.

Priority: Rannoch[]

Priority: Thessia[]

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