There are 9 unique codex entries in the Lore section on Odessen. 7 are accessible to all players regardless of class or faction and 2 are unobtainable.
Alliance Intelligence Report: A Cause for Concern is unobtainable.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: None
Alliance Intelligence Report: A Common Thread is unobtainable.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: None
Be'manda Skira: Kol's Insurrection is obtained from interacting with the Holotable during "Desperate Defiance" mission.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: None
Designs of Nul is obtained from speaking with Hylo Visz during "Old Wounds" mission.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: None
Malgus Untethered is obtained from speaking with Darth Rivix as an Imperial player or Master Gnost-Duralduring as a Republic player during "Secrets of the Enclave" mission.
Coordinates: -159, 263 | -158, 263
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: None
Mass Shadow Generator is obtained from speaking with PERSON during "Secrets Unmasked" mission.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: None
State of the Galaxy - Resource War is obtained from speaking with Theron Shan during "Crisis on Umbara" mission.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: None
The Chiss Ascendancy and the Eternal Empire is obtained from speaking with Lana Beniko during "A Traitor Among the Chiss" mission.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: None
The Fall of the Scions is obtained from interacting with the Ship Controls during "Echoes of Oblivion" mission.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: None