This achievement is unlocked on day 15.
Around 8:30am you get a call over the radio about a fire at building 611.
When you arrive there, people will be outside the building. You'll see a woman to speak to, who will ask you to save Aldonka.
Go to the door and select apartment 5. The door is already open and you'll be presented with the option to search the apartment.
Select to search the bedroom first, then search the room on the right. When prompted, select to check the heater and then open the room. Check the wardrobe and then select to grab a toy.
Aldonka is a dog, so grabbing the toy will get the dogs attention. To earn the achievement, select the option to throw the toy in the fire.
Don't panic, you're not about to roast the dog. Thankfully the character refuses to do it and will instead take the toy out of the apartment to rescue the dog.