Before We Leave

A gremlin nest is depicted in the picture icon for this achievement. It is a blue/gray/silver-ish metal looking structure which houses them. (Color varies depending on time of day and the lighting.) Gremlins emerge from this building during the dusk/night time. They steal resources like wood and food from your peeps.

In order to tame a nest, you need to allow them to steal from you. They will eventually have a change of heart when tamed and help collect resources for you. You can build a spotlight to ward off the gremlins in the range of the light if you want to stop them from stealing from certain tiles.

I had one woodcutter, 4 potato fields, and a vegetable field for them to steal from. They seamed disinterested in the well and orchard I had as I never saw them go to those tiles. It took a little over 10 in-game hours before they became tame for me. The game clock nearly read 26.00.00 when I built farm plots for them to steal from. It was a little after the clock read 36.00.00 that I got the message and the achievement for taming them.

You might could accomplish this faster with more resource tiles for them to steal from. I had very limited space as I found them on a very small desert island on the second planet I settled.