After taking the key and a little further the perimeter with the key will be repeated, but in this case the girl will be sitting, using “Smash” you can get your first achievement.
P.S. In general, any kill of a "living" person will give you this achievement.

After opening the door there will be a dog sitting in the corner. Using “Touch” you will pet the dog and get the achievement.

By interacting with the dog using "Talk" six times, he will reveal his true face and you will receive the achievement.

At the "Sewage Treatment" level we find a passage closed by a grate on the left there will be a note, on the right there is a lever that will open the passage.
Then there will be a staircase on the left, you can return to the beginning of the level, and on the right there is a narrow passage, which is where we need to go.
After killing the monster, we find and approach the statue, receiving the achievement.

After clearing the territory, this object called “Egg” appears, after using “Touch” you will complete the level and receive the achievement.

On the map for selecting the next location, an additional place "Transient Location" may appear where you can visit, just start an additional level and get the achievement.

In the "Children's Hospital" location, after their elevator exits, you need to go a little forward, turn left and go down and turn left again.
There will be a note on the wall, to the right of this note you can see a strange wall that can be broken with the help of “Smash”, behind this wall there will be a strange-shaped creature, we are not interested in it, we go further to the left, to the right, there is no difference.
At the end of this secret path will be our goal, just get closer to it and get the achievement.

After passing the three main locations, the “Entrance” location will appear on the map, everything there is linear, you will receive an achievement upon any contact with this sphere.

After finishing the game, do not rush to exit it, wait until the vocal version of the music "Bad Chest Feel Don't Touch your Feet Together" plays in the main menu.

After you complete the game, click the continue button, an additional special location will appear on the map.
This will be a kind of library with a piece of paper at the end of the path, you should look through it using “Touch” and return in the opposite direction from where you came.
After this, “Entrance” will be replaced by “Exit”, now go through “Exit”.
After the cutscene will we appear on the surface? However, any interaction with a dog by the road will give you an achievement.

P.S. Translated by Google Translate, there may be errors.