Hi everyone.

I've finished the game and then talked to everyone, including Theo, Sleipnir and Othar.
I've also found all the portraits (including that special one), artifacts and Dingbot Sergeants.
"Lore segments found" in the stats says I've found 64/65. I've retraced my way through the castle a couple of times and made sure that I interacted with any sparkling object I could find.
Can anyone help me out with the entriy I've missed?
Thanks in advance.

My "Lore" tab looks like this:

Characters tab:
Friends - Agatha, Sanaa Wilhelm (with Sanaa Trygvassen update), Dingbot, Moloch von Zinzer, Krosp, Zeetha, Daughter of Chump, Tarvek Sturmvoraus (with "Tarvek and Gil" update), Violetta Mondarev, Gilgamesh Wulfenbach (with "Gil and Tarvek " update), Othar Trygvassen (gentleman adventurer), Sleipnir O'Hara, Theopholous DuMedd.

Foes - Dr. Silas Merlot, Zola, Baron Klaus Wulfenbach.

Heterodyne family - Faustus Heterodyne, Punch and Judy, Bacchus Heterodyne, Bludtharst Heterodyne, Euphrosynia Heterodyne, Vlad Heterodyne, Satyricus Heterodyne, Ghengis Ht'rok-din, Knife Heterodyne, Iago Heterodyne, Pluto Heterodyne, Vipsania Heterodyne, Bill Heterodyne, Robur Heterodyne, Lucrezia Mongfish, Clementhious Heterodyne, Igneous Heterodyne, Barry Heterodyne.

World tab:
Places - Castle Heterodyne, Castle Wulfenbach, Sturmhalten, Mechanicsburg.

The story so far - Intro and Chapters 1 through 7.

Fodder - Chicken Clank, Sting-Ray, Fencing Clank, Nyar Spider, Fencing Clank Captain, Toxic Chicken Clank, Shield Clank.

Miscellaneous - The Spark, Crypt Clank, Movit, Jagermonsters, Otilia, Nepenthes Dulcis.

Events - The Attack on the Castle and The Siege of Mechanicsburg.

Artifacts - all 20 of them, and also I've interacted with every artifact on their pedestals.

I didin't buy every comix from the owl clank (there are 8 more to go), but I'm not sure those are needed for the achievement.