This War of Mine: The Little Ones

Got this method on a steam achievement guide and I found it extremely helpful:

The goal is to reach a certain level of comfort, you can check it when you open the inventory screen in base. The orange text tells you the current comfort and the wall of text below gives you hints on how to improve it.
Here are a few things that increase comfort:
Build Enough bed for people
Armchairs
Guitar will help
Have a radio
Decent amount of book

From the off the easiest way to do this is to go straight in to scavenging. Write your own story just like the others, put the threat level to its lowest and this will stop raids until a little way in to the progression of the war.
Once you have enough resources, build an improved workbench. from here you can build armchairs and better furniture, build one of each for the achievement.

NOTE: on my friends profile we had to also create a guitar and have an adult play it for him to unlock it. I'm not sure if it's a little glitch or not.

I built the guitar, had a character play it, and the achievement popped. If there is anything else to it I would appreciate others sharing that information for others.