There are 7 unique codex entries in the Locations section on Korriban. They are all faction specific.
Sith Academy is obtained near a proximity map trigger.
Codex type: Locations | Faction: Imperial | Class: All
Associated Achievement: None
The Wilds is obtained near a proximity map trigger.
Codex type: Locations | Faction: Imperial | Class: All
Associated Achievement: None
Tomb of Ajunta Pall is obtained near a proximity map trigger.
Codex type: Locations | Faction: Imperial | Class: All
Associated Achievement: None
Tomb of Marka Ragnos is obtained near a proximity map trigger.
Codex type: Locations | Faction: Imperial | Class: All
Associated Achievement: None
Tomb of Naga Sadow is obtained near a proximity map trigger.
Codex type: Locations | Faction: Imperial | Class: All
Associated Achievement: None
Tomb of Tulak Hord is obtained near a proximity map trigger.
Codex type: Locations | Faction: Imperial | Class: All
Associated Achievement: None
Valley of the Dark Lords is obtained near a proximity map trigger.
Codex type: Locations | Faction: Imperial | Class: All
Associated Achievement: None