There are 2 unique codex entries in the Achievement: Titles section on Alderaan. 1 is faction specific and 1 is unobtainable.
Champion of House Thul was obtained from speaking with Lord Jorad Thul during "Traitor" mission. It is unobtainable.
Codex type: Achievement: Titles | Faction: Imperial | Class: All
Associated Achievement: None
Paladin of House Organa is obtained from speaking with Duke Charle Organa during "Paladins" mission.
Codex type: Achievement: Titles | Faction: Republic | Class: All
Associated Achievement: None