Right as you start, look to your left, and under this pillar, is the first collectible. (NOTE: The collectibles won't be in exact order, I just put them in the order I found them.)

After entering the main area with the fountain, walk to your right and crouch, second collectible is on top of the barrel.

After picking up the second collectible, enter the castle and walk over to the dinosaur skull fireplace, to the right are some logs, and the collectible itself.

After picking up the 3rd collectible, take the stairs to your right and the door to the left, collectible 4 is behind this table.

After picking up the 4th collectible, take the stairs to the right of that area and keep walking forward until you reach another set of stairs to the left of the first trader, walk over to the next area and look to this metal bar door to the left.

Right after picking up the 5th collectible, turn around and keep walking forward until you reach the L stairs where the big statue is. After reaching, look to your right to the sewer opening and there it is.

After picking collectible 6 up, turn around again and go left, walk over to the two tables next to the wall and bam.

The next collectible is literally up front after the tables, just walk over to the mine entrance and there is collectible 8, next to some rocks. (Careful on this one, as this entrance is a Zed spawn.)

Another one right after the other. Go to your left from the mine entrance over to the waterfall and look in between the marble railings.

For the next one, keep walking forward until you reach the death pit trap, go to your left to where the hanging bells trap is and stop in front of the trap, turn around and there it is. (After this collectible, you will get the seasonal objective and achievement done, but as stated, this guide includes every collectible possible.)

Right after picking the last collectible up, keep walking over to DJ Hans, get close to the railings, and over on his DJ booth, there is the 11th collectible.

Now turn around after the last collectible, take the steps and look to the table on your left, collectible is right next to it.

Right after picking that collectible up, take the door right behind and keep going downstairs and through the trader zone until you reach the bloodied area with the prison cells, there are 3 collectibles here, one to the left after entering the area stabbed on a spike.

The second one is on the second prison cell, inside the toilet.

Third one is between the barrels on the death pit trap.

After picking the last 3 collectibles up, walk all the way to the library trader and look up to the wooden beams on the ceiling.

Right after that, go down the stairs behind you, where the medieval armor and weapons hang on the wall, there's another collectible between some furniture.

On that same area, keep walking down the hall until you reach the trader, look out the window to the left of the trader, and there's collectible 18.

The 19th collectible is on the very first room of that same hall, sitting on a chair. (Careful on this one too, since the room next to it is a Zed spawn.)

The next collectible is over on the DJ Hans area, get close to the railings once again, but this time, turn around and look up, surprise surprise. (Both this one and the wooden beams one on the library took a WHILE to find, whew.)

And alas, the last collectible. It's hiding next to this couch on the torture room trader.

Here is a little easter egg as a quick bonus. If you decide to open the alchemy room, which costs 1250 Dosh, on one of the tables to the left after entering are two crates with glass panels, one of them is darkened though, I'll show you how to clear it.


First off, go over to the trader next to the death pit and hanging bells traps, on this wall, there's a brick you can activate.


Right after that, go to the trader on the torture room with the green lighting, next to the bloodied area, this part of the wall will open up, revealing this weird spray and a candle you can activate.


To finish up, go over to the library trader yet again, and look at the bookshelves, there's a book there that can be activated now.


After completing these three steps, enter the alchemy room again, look at the crates again and there you have it. (Won't put a pic to not spoil the little surprise.)
Enjoy!

Thanks for taking the time to read this guide, I hope it helped you!
Hopefully I'll make more guides in the future, until then, cya!