Bury the Dead
After clear Layerback Nest Ataro Baatar will give you quest to bury the dead colonist.
How to do it?Edit
First you need to search the colonist bodies for ash boxes.
Then you need to take this, it will be placed in your inventory (2 boxes).
Second you need to dig some hole (small) and place there ash boxes.
Third you will need to enter build mode (Press "B") and place 2 block upper the ash boxes.
Quest should be completed.