There are 8 unique codex entries in the Lore section on Quesh. 7 are accessible to all players regardless of class or faction and 1 is class specific.
Atmosphere of Quesh is obtained from speaking with Imperial Vaccination Officer during "Toxic Clash" mission as an Imperial player or Republic Commando during "Quesh Inoculation" mission as a Republic player. It is obtained with Quesh Venom codex as an Imperial player.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: Loremaster of Quesh
Discovering Quesh Venom is obtained from interacting with a Clickable Grate.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: Loremaster of Quesh
Hutt Neutrality is obtained from interacting with a Clickable Banner.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: Loremaster of Quesh
Military Adrenals is obtained from speaking with Sergeant Molvar during "Blood and Venom" mission as an Imperial player or interacting with the Fortified Chamber Door during "The Republic Strikes Back" mission as a Republic player.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: Loremaster of Quesh
Quesh Venom is obtained from speaking with Imperial Vaccination Officer during "Toxic Clash" mission as an Imperial player or Goonawaro during "Venom Cleanup" mission as a Republic player.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: Loremaster of Quesh
The Quake is obtained from interacting with a Clickable Boulder.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: Loremaster of Quesh
The Shadow Arsenal (Agent) is obtained from speaking with the Personal Holocom during "The Shadow Arsenal" mission.
Codex type: Lore | Faction: Imperial | Class: Imperial Agent
Associated Achievement: None
The Three Families is obtained from interacting with a Clickable Banner.
Codex type: Lore | Faction: Both | Class: All
Associated Achievement: Loremaster of Quesh