There are 7 unique codex entries in the Achievement: Datacrons section on Corellia. They are accessible to all players regardless of class or faction.
MGGS is purchased from Lain-Ricie for 10,000 credits and is required to access the codex.
Galactic History 61: The Brotherhood is Broken is obtained from interacting with the Green Matrix Shard datacron.
Codex type: Achievement: Datacrons | Faction: Both | Class: All
Associated Achievement: Corellian Datacron Master
Galactic History 62: The Great Sith War Ends is obtained from interacting with the Blue Matrix Shard datacron.
Codex type: Achievement: Datacrons | Faction: Both | Class: All
Associated Achievement: Corellian Datacron Master
Galactic History 78: The Sith Triumvirate is obtained from interacting with the +4 Blue Mastery datacron.
Codex type: Achievement: Datacrons | Faction: Both | Class: All
Associated Achievement: Corellian Datacron Master
Galactic History 79: The Conclave at Katarr is obtained from interacting with the +4 Purple Mastery datacron.
Codex type: Achievement: Datacrons | Faction: Both | Class: All
Associated Achievement: Corellian Datacron Master
Galactic History 80: A Return from Exile is obtained from interacting with the +4 Yellow Presence datacron.
Codex type: Achievement: Datacrons | Faction: Both | Class: All
Associated Achievement: Corellian Datacron Master
Galactic History 81: The Battle of Telos Four is obtained from interacting with the +4 Orange Mastery datacron.
Codex type: Achievement: Datacrons | Faction: Both | Class: All
Associated Achievement: Corellian Datacron Master
Galactic History 82: Darth Traya's Return is obtained from interacting with the +4 Red Mastery datacron.
Codex type: Achievement: Datacrons | Faction: Both | Class: All
Associated Achievement: Corellian Datacron Master