There are 4 bestiary entries on Quesh. All four are required for the Beastmaster of Quesh achievement.
A Harvap codex entry location obtained from a Diseased Harvap.
Codex type: Bestiary
Codex location: Quesh
Codex coordinates: 98, 1471
Faction: Both
Class: Bounty Hunter - Imperial Agent - Jedi Consular - Jedi Knight - Sith Inquisitor - Sith Warrior - Smuggler - Trooper
Associated Achievement: Beastmaster of Quesh
A Harvorisk codex entry location obtained from a Feral Harvorisk.
Codex type: Bestiary
Codex location: Quesh
Codex coordinates: 537, 698
Faction: Both
Class: Bounty Hunter - Imperial Agent - Jedi Consular - Jedi Knight - Sith Inquisitor - Sith Warrior - Smuggler - Trooper
Associated Achievement: Beastmaster of Quesh
A Lobel codex entry location obtained from a Venemous Lobel.
Codex type: Bestiary
Codex location: Quesh
Codex coordinates: 206, 1495
Faction: Both
Class: Bounty Hunter - Imperial Agent - Jedi Consular - Jedi Knight - Sith Inquisitor - Sith Warrior - Smuggler - Trooper
Associated Achievement: Beastmaster of Quesh
A Trinthan Prowler codex entry location obtained from a Savage Trinthan Prowler.
Codex type: Bestiary
Codex location: Quesh
Codex coordinates: 176, 794
Faction: Both
Class: Bounty Hunter - Imperial Agent - Jedi Consular - Jedi Knight - Sith Inquisitor - Sith Warrior - Smuggler - Trooper
Associated Achievement: Beastmaster of Quesh