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Attention! This achievement also connected with "Question of Faith" quest which will be given you by Eva in the Hort.
First Photo
Second Photo
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Third Photo
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Fourth Photo
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Fifth Photo
Sixth Photo
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Seventh Photo
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Eight Photo
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Ninth Photo
End
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At the moment when you collect all nine notes - go to Eva in the Hort. She will help you with this puzzle and will make mark point on your map.
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Then you must travel to this point and find a elevator.
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Then you just need come to the code panel. Password to this panel you can find from puzzle with notes.
Password: 7817
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Now prepare to know all truth about Calaan.
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And also you will get a cool photo :)
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You will get achievement when you unlock all two code panels and walk around in this place.
Caalan Achievement (Quick Version)
Source: https://gameplay.tips/guides/1384-elex.html
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