This War of Mine: Final Cut

You need the "All expansions pack" add-on.

In order to get this achievement you have to teach a child to make everything you can teach him (just teach, for this achievement he does not have to create anything). When playing with a child in the shelter, in the crafting menus, you will now get the option "teach".

The things you have to teach him/her to craft are:

In advanced workshop: fuel and fillter.
In crude stove: cooked food.
In vegetable garden: fertilizer, vegetables and herbs.
In improved herbal workshop: bandages, cigarette, homegrown tobacco, roll-up cigarette and quality roll-up.
In trap for small animals: raw food.
In rainwater collector: clean water.

(I have put in bold font all you need to improve to have access to everything.)

Now select My own scenario.
Choose for example 1 adult and 1 adult + his/her child.
Days until ceasefire: I got the achievement on day 19, just in case put at least 30 days.
Intensity of the conflict: low.
Winter comes: never.
And select the places on the map you want to have access.