There are 7 unique codex entries in the Bestiary section on Imperial Taris. 6 are accessible to all players regardless of class or faction and 1 is faction specific.
Bogstalker is obtained from killing a Bogstalker Drone.
Codex type: Bestiary | Faction: Both | Class: All
Associated Achievement: Beastmaster of Taris (Republic)
Ferrazid Hound is obtained from killing a Ferrazid Scavenger.
Codex type: Bestiary | Faction: Both | Class: All
Associated Achievement: Beastmaster of Taris (Republic)
Nekghoul is obtained from killing a Nekghoul Horde Leader.
Codex type: Bestiary | Faction: Both | Class: All
Associated Achievement: Beastmaster of Taris (Republic)
Nexu is obtained from killing a Prowling Nexu.
Codex type: Bestiary | Faction: Both | Class: All
Associated Achievement: Beastmaster of Taris (Republic)
Rakghoul is obtained from killing a Lumbering Rakghoul.
Codex type: Bestiary | Faction: Both | Class: All
Associated Achievement: Beastmaster of Taris (Republic)
Tarsarian Devourer is obtained from killing a Tarsarian Devourer. It can also be obtained from killing Collared Arkonok on Onderon.
Codex type: Bestiary | Faction: Imperial | Class: All
Associated Achievement: None
Varactyl is obtained from killing a Prowling Varactyl.
Codex type: Bestiary | Faction: Both | Class: All
Associated Achievement: Beastmaster of Belsavis