There are 3 unique codex entries in the Achievement: Datacrons section on Hutta. They are faction specific.
Galactic History 01: The Architects is obtained from interacting with the +2 Blue Mastery datacron.
Codex type: Achievement: Datacrons | Faction: Imperial | Class: All
Associated Achievement: Hutta Datacron Master
Galactic History 02: Ancient Civilizations is obtained from interacting with the +2 Yellow Presence datacron.
Codex type: Achievement: Datacrons | Faction: Imperial | Class: All
Associated Achievement: Hutta Datacron Master
Galactic History 03: The Battalions of Zhell is obtained from interacting with the Blue Matrix Shard datacron.
Codex type: Achievement: Datacrons | Faction: Imperial | Class: All
Associated Achievement: Hutta Datacron Master