Here is my Dxun Cipher Achievement Guide!
Similar to the Ciphers found on Dantooine, Ossus and Rishi, there are also Ciphers in the new Operation, The Nature of Progress also known as the Dxun Operation.
The achievement is located under Operations -> The Nature of Progress -> Mark of Mastery.
All the Ciphers are located in the second and third boss encounter area (Breach CI-004: Lights Out and Breach CI-004: According to Plan).
Volumes 1 and Volume 3 are both located indoors and have separate maps below.
The Ciphers, like other Ciphers, look like small blue clickable books. Once a Cipher has been clicked on by one member of the Operations group, it will count for everyone in the group.
Note: the tooltips for each Cipher are bugged. They all say ‘The Secrets of Czerka, Vol 1‘. This does not affect your ability to get the achievement, you will still get the achievement since the game considers each Cipher a separate volume despite the inaccurate tooltips.
The Secrets of Czerka, Vol 1
The first Cipher is located in the room you initiate the second boss encounter (Breach CI-004: Lights Out). Be sure to find the Cipher before you click on the console to start the encounter!
This volume has multiple spawn locations so be sure to thoroughly check for it. You may have to zoom in for it to appear.
The Secrets of Czerka, Vol 2
Volume 2 has a couple of different spawn locations in the first half of the beast pens. (Yes, it is there amongst the grass).
The Secrets of Czerka, Vol 3
Volume 3 is located in the room where you complete the second boss encounter (Breach CI-004: Lights Out) and start the third boss encounter (Breach CI-004: According to Plan). This Volume also has multiple spawn locations so be sure to do a thorough check before starting the third encounter. You may need to zoom in for the Cipher to appear.
The Secrets of Czerka, Vol 4
Volume 4 is located in the northeast corner of the beast pens. It seemingly only has one spawn location. You can obtain it either before finishing the second boss encounter (Breach CI-004: Lights Out) or after starting the third boss encounter (Breach CI-004: According to Plan). It’s up to you and your group!
The Secrets of Czerka, Vol 5
The final volume is located to the east of the crab lake and has two known spawn locations.
Thank you Theho for sending me initial info about this many months ago (sorry it took me so long to finally do the guide). Thank you also to Dyro and Andynul for providing info on additional spawn locations.
And thank you to my guildies who helped with a quick 3-boss run so I could take new screenshots and who helped with past runs to find the Ciphers.