This guide will help you find the 9 familiar's illustrations (needed for the Illustration achievement), the 10 VHS (needed for the Be Kind, Rewind achievement), the 2 lost tapes (needed to fulfill your completionisme obsession) and the "Voice" cassette (needed for the Voice achievement).

This guide won't go into details for the Voice and Be Kind, Rewind as there is already a guide for that. This will just be a visual support in case you struggle in finding the VHS. Just keep in mind that only collecting them is not enough to get the achievement.

As you should know, the game is separated into two distinct parts, namely before Hugo's party and after. Some parts of the map will change and some floors will become unavailable. Make sure to get what you need before opening the tomb and triggering the party event.
I will specify for each item if they are available before or after the party (or all the time).

Note: The illustration of The White Wolf actually has an event that needs to be started with a tricky time window. I recommend to check the White Wolf's section of this guide first if you don't want to miss it.

Be extremely careful when you go for the Dot Matrix on the 4th floor. You need to reset the second cubicle you encounter on the map or you will not be able to get back to the Dot Matrix's lair after the boss fight.
Failing to do so will prevent you from getting the "Voice" cassette and may make you miss the "The Weary Human Face" VHS (the VHS is available before the boss fight, but if you didn't got it you will need the map to be accessible for you to come back).

The Bat's illustration can be found in the archives on the 7th floor, but you have to go to the 9th floor first to see the post-it on the wall.

Once this is done, you can go check the bookshelf BX to get the illustration.

The Spider's illustration is found right next to the Bat's. If you move down all the bookshelves on the right, you can spot a crack in the wall. The illustration is in it.

The Owl's Illustration is found in the room containing the Hexenhammer, on the bookshelf behind the mummy. If you left this room without getting the illustration, it can be accessed again once you leave and re-enter the library after the boss fight.

The Snake's illustration is in a shelf at the end of the room at the bottom left of the 2nd floor. You need to have the Poison Gas Contract or have cleared the poison gas to get to this room.

The Cat's illustration is in Sosa's desk.

The White Wolf's illustration is found on the 5th floor and require to trigger an event with a specific timing in order to get it. You will first need to light A.M.'s altar as soon as possible and then carry on your business.

You have to come back after getting the photo from the mouth in the HR Department to find a woman praying near the altar.
You need to talk to her at least once and she will leave once you give the photo to Sintra.

Then you can be on your merry way again and come back once the woman has left. She will leave the White Wolf's illustration behind.
Once you have talked to the praying woman, you should be able to find the illustration here after Hugo's party if you haven't got it before then.

The Toad's illustration is found in Corvo's lair on the 4th floor. It is accessible from the bottom left of the main floor but you will need the Poison Gas Contrat to get there.
Once in the lair, you can find the illustration in the bookshelf.

The Crow's illustration is found in Corvo's secret floor. You will have to pass through there to advance in the story, so just grab the illustration on the way. It is in a fallen locker on the left of the elevator.

The Rat's illustration is on the desk where you signed your contract on the 10th floor. The Illustration should still be there even after Hugo's party. Be careful as it may get in your way if you try to steal the dagger.

The first VHS is found in the archives on the 7th floor, at the bottom right corner of the room filled with mines.

The second VHS is in one of the toilets on the 5th floor, in the one that is occupied by a man at the beginning of the story. Just come back after doing the library section and the stall should be free.

The third VHS is in the right locker below Kate on the 4th floor. You will need to crawl to get it.

The fourth video can be found on the 8th floor, in a secret path behind the man sitting on the bench.
Follow the arrow and you will find the VHS in a wooden box.

The fifth VHS is found on your way to the Dot Matrix's lair on the 4th floor. You will have to crawl under a desk and dodge the vomit man spinning on himself to access the south portion of the second map.
The VHS is in the left locker.

The sixth VHS is found in the cemetery, in a wooden box hidden behind a tomb. You will need the key found on Corvo's secret floor to open the gates and get the VHS.

The seventh VHS is available after Hugo's party, on the 5th floor. It is in a suitcase on the north-east part of the floor, next to a dead man.

When you go to the exposition on the 9th floor, you need to look at the 14 paintings which aren't the red lady before triggering the event which gives you Sintra's head.
If you did it right, you will find the VHS once you leave with the head, in a suitcase where the Dot Matrix was.

The ninth VHS is in the secret lab on the 3rd floor, in one of the machines at the back, beside the table where you find Sintra's body.

This is the last VHS needed for the Be Kind, Rewind achievement. Note that once you go for this VHS, you won't be able to go back, so you need to free Sosa and watch the 9 other VHS before that (you don't need to watch this one to get the achievement, not that you can anyway).

The tenth VHS is found in the underwater section of the endgame, in a suitcase in the south-east part of the maze. It is protected by a mine, so you will need a pencil to get to it.

The first Lost Tape is found in the videoclub on the 7th floor. The room has to be empty to get it (or I am just bad at clicking, one or the other).

Once you have fought the Dot Matrix, you can go back to the 8th floor (ideally through the shortcut in the 5th floor bathroom if you have unlocked it) to get the VHS.
The second lost tape is in the wooden boat where a naked employee was sitting the first time you went through the river.

The cassette tape is found in the wooden box near the hole where you jumped to escape the Dot Matrix.

That's it. If I got anything wrong or forgot something, do tell me and I will edit this guide. I can finally put this game to rest until an eventual DLC comes out.

Good luck in your search!

• god tier tree trunk-sama: Debunking that the Rat Illustration was unavailable after Hugo's Party.
  
• The Flying Red Robot: For clarifying that you have to talk to the praying lady to get the White Wolf Illustration.
  
• Royyst3r and PortalDame: Finding out the timing to trigger the event for the White Wolf's illustration.