This achievement can be completed very easily and quickly using Map Creator; I made a compact map that has everything you need for a quick completion.

Link: https://drive.google.com/drive/folders/12thnZ6v0_BC9PGbh70vwmN_25yV4-i-F?usp=sharing

In order for the map to be selected in the game, you need to transfer the "pidor.cbmap2" file to a folder in this path:
Steam\steamapps\common\SCPCBR\Map Creator\Maps

After that we open the game -> New Game -> Load Map -> Click on Load next to "pidor.cbmap2" -> Select Keter difficulty -> Start Game

Now let's move to what you actually have to do. I have mapped out all room locations for you:


You know how to beat the game, so good luck to you in getting the achievement. And yeah, remember that some things, like the appearance of SCP 173, or where MTF will go depends on randomness.

Good luck!