There are 140 unique codex entries in the Achievement: Epic Enemies section from Operations. 2 are accessible to all players regardless of class or faction and 138 are unobtainable. For brevity they are simply listed.
Xenoanalyst II is obtained from killing Xenoanalyst II during "Unity Assessment" mission.
Codex type: Achievement: Epic Enemies | Faction: Both | Class: All
Associated Achievement: None
Xenoanalyst II (Veteran Mode) is obtained from killing Xenoanalyst II during "Unity Assessment" mission in [VETERAN] difficulty.
Codex type: Achievement: Epic Enemies | Faction: Both | Class: All
Associated Achievement: None