This is a guide to finding the information available to you through the Galactic Codex. There is not necessarily only one way to receive a certain codex entry, but these are some of the circumstances in which an entry can be gained.

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Primary Codex Entries:

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Aliens: Council Races
Asari - Talk to the Embassy Receptionist on the Presidium
Salarians - Talk to Anderson after the Council hearing
Turians - Start a new game

Aliens: Extinct Races
Protheans - Talk to Anderson and Nihlus before Eden Prime
Rachni - Talk to Avina Tourism Terminal III

Aliens: Non-Council Races
Batarians - Talk to Anderson after becoming a Spectre
Elcor - Talk to Calyn in the Volus/Elcor Embassy
Geth - Talk to Ashley on Eden Prime
Hanar - Talk to the Emporium Shopkeeper on the Presidium
Keepers - Talk to Avina Tourism Terminal II
Krogan - Learn about Wrex from Barla Von
Quarians - Learn about the quarian from Dr. Michel or Wrex
Volus - Talk to Din Korlack in the Volus/Elcor Embassy

Aliens: Non-Sapient Creatures
Husks - Encounter Husks on Eden Prime
Thresher Maws - Defeat the thresher on Edolus and inspect the marine
Varren - Talk to Davin Reynolds about the food shortage on Feros

Citadel and Galactic Government
Citadel - Talk to Captain Anderson after Eden Prime
Citadel Council - Tank to Anderson and Udina on the Citadel
Citadel Space - Approach the galaxy map on the Normandy
Spectres - Talk to Jenkins and Chakwas before Eden Prime

Humanity and the Systems Alliance
Earth - View Earth on the Galaxy Map
First Contact War - Talk to Pressly before Eden Prime
Systems Alliance - Start a new game

Planets and Locations
Planet: Feros - Talk to Expat in the Upper Markets on the Citadel
Planet: Ilos - Arrive on Ilos
Planet: Noveria - Talk to Expat in the Upper Markets on the Citadel
Planet: Virmire - Learn about Virmire from the Council
Region: Terminus Systems - Talk to Anderson before Eden Prime
Uncharted Wolds - Talk to Anderson before leaving the Citadel

Ships and Vehicles
FTL Drive - Talk to Chief Engineer Adams
Military Ship Classifications - Talk to Chief Engineer Adams
Normandy - Talk to Chief Engineer Adams
Sovereign - Talk to Matriarch Benezia
Space Combat - Inspect the Gunnery Station on the Normandy
Vehicles: M35 Mako - Inspect the Mako on the Normandy

Technology
Biotics - Talk to Dr. Chakwas about Kaidan
Computers: Artificial Intelligence (AI) - Find an AI on the Citadel
Computers: Virtual Intelligence (VI) - Talk to Avina Terminal I
Element Zero ("Eezo") - Examine the Normandy's Element Zero Core
Mass Effect Fields - Examine Field Integrity Monitor on Normandy
Mass Relays - Talk to Avina Tourism Terminal II
Omni-tool - Talk to the Alliance Requisition Officer

Weapons, Armor and Equipment
Body Armor - Investigate the dig site on Eden Prime
Kinetic Barriers ("Shields") - Examine Jenkins' body on Eden Prime
Mass Accelerator - Inspect the weapons from outside the Normandy
Medi-gel - Use the aid station in the medical bay on the Normandy
Small Arms - Examine the weapons locker in C-Sec Traffic Control

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Secondary Codex Entries:

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Personal History Summary
Profile - Start a new game

UPDATE: Bring Down the Sky
Technology: Translation - Encounter Batarians on Asteroid X57

UPDATE: Pinnacle Station
Technology: Combat Simulator - Finish the challenges on Pinnacle Station
Technology: Pinnacle Station - Land at Pinnacle Station
Technology: Prefabricated Structures - Visit your apartment on Intai'sei

Aliens: Council Races
Asari: Biology - Pursue a relationship with Liara
Asari: Culture - Talk to Liara
Asari: Government - Talk to Liara
Asari: Military Doctrine - Talk to Shiala on Feros
Asari: Religion - Talk to Liara
Salarians: Biology - Talk to Kaidan
Salarians: Culture - Decrypt the comm terminal near Liara on Virmire
Salarians: Government - Talk to Captain Kirrahe on Virmire
Salarians: League of One - Find a salarian artifact
Salarians: Military Doctrine - Talk to Captain Kirrahe on Virmire
Salarians: Special Tasks Group - Learn about Virmire from the Council
Turians: Biology - Talk to Garrus
Turians: Culture - Talk to Garrus
Turians: Government - Talk to Garrus after finding Dr. Saleon
Turians: Military Doctrine - Talk to Garrus
Turians: Religion - Talk to Garrus after finding Dr. Saleon
Turians: The Unification War - Find a turian artifact

Aliens: Extinct Races
Protheans: Beacon - Talk to Liara
Protheans: Cipher - Talk to Liara about your visions
Protheans: Data Discs - Find a Prothean artifact
Protheans: Mars Ruins - View Mars on the Galaxy Map

Aliens: Non-Council Races
Geth: Armatures - Fight a Geth Armature on Therum
Geth: Hoppers - Encounter the "Hoppers" on Therum
Krogan: Biology - Talk to Wrex
Krogan: Culture - Talk to Wrex
Krogan: Genophage - Talk to Wrex
Krogan: Krogan Rebellions - Talk to Avina Tourism Terminal III
Krogan: Military Doctrine - Talk to Wrex after finding his armor
Quarians: Economy - Talk to Tali
Quarians: Government - Talk to Tali
Quarians: Law and Defense - Talk to Tali
Quarians: Migrant Fleet - Talk to Tali
Quarians: Pilgrimage - Ask Tali about her Pilgrimage
Quarians: Religion - Talk to Tali

Citadel and Galactic Government
Citadel Conventions - Examine diplomatic archives in the embassy
Citadel Station: Citadel Security Services (C-Sec) - Talk to Pallin
Citadel Station: Presidium Ring - Talk to Embassy Receptionist
Citadel Station: Serpent Nebula - View nebula outside Med Clinic
Citadel Station: Statistics - Talk to Anderson after Eden Prime
Citadel Station: Wards - Talk to Barla Von on the Citadel
Treaty of Farixen - Examine diplomatic archives in the embassy

Humanity and the Systems Alliance
Genetic Engineering - Talk to Rafael Vargas on Noveria
Human Diplomatic Relations - Talk to Pressly
Systems Alliance: Geological Survey - Survey a metal, mineral, or gas
Systems Alliance: Military Doctrine - Talk to Ashley
Systems Alliance: Military Jargon - Examine NAVMANUAL on command deck
Systems Alliance: Military Ranks - Check the manual on your desk
Systems Alliance: N7 - Examine Shepard's locker on the Normandy
Terra Firma Party - Talk to Charles Saracino on the Citadel
Timeline - Start a new game

Planets and Locations
Stations: Arcturus Station - Ask Joker about his history
Stations: Gagarin Station - Talk to Kaidan about Jump Zero

Ships and Vehicles
FTL Drive: Appearance - Examine the viewport near Joker
FTL Drive: Drive Charge - Inspect the Normandy's Core Charge Status
Space Combat: Combat Endurance - Inspect the ship's Heat Load Monitor
Space Combat: General Tactics - Examine NAVMANUAL in Udina's office
Space Combat: Planetary Assaults - Talk to Ashley
Space Combat: Trans-Relay Assaults - Talk to Vigil on Ilos
Starships: Carries - Use Intimidate with Mikhailovich or Al-Jilani
Starships: Crew Considerations - Examine the Sleeping Pods
Starships: Cruisers - Examine the Tracking Terminals in C-Sec Academy
Starships: Dreadnought - Overhear a conversation in the Wards
Starships: Fighters - Examine the Tracking Terminals in C-Sec Academy
Starships: Frigates - Examine the Tracking Terminals in C-Sec Academy
Starships: Heat Management - Inspect the ship's Heat Load Monitor
Starships: Sensors - Talk to Pressly before Eden Prime
Starships: Thrusters - Inspect the Normandy's rear hull
Vehicles: Combat Drones - Inspect the Rogue VI on Luna
Weapons: Ablative Armor - Inspect hull from outside Normandy
Weapons: Disruptor Torpedoes - Check Peak 15's Gravitic Weapons Research
Weapons: GARDIAN - Inspect the Normandy's Point Defense Systems
Weapons: Javelin - Talk to Vigil on Ilos

Technology
Biotics: Biotic Amps - Talk to Dr. Chakwas about Kaidan
Biotics: Life as a Biotic - Talk to Kaidan
Biotics: Training - Talk to Kaidan about his training
Communications - Examine the FTL Comm Link on the Normandy
Communications: Administration - Access the Wards' Extranet Terminal
Communications: Methodology - Inspect server node at ExoGeni on Feros
Credits ("Creds") - Talk to the Emporium Shopkeeper on the Presidium

Weapons, Armor and Equipment
Upgrades - Open an upgrade kit