Keep in mind that you have to complete the tutorial in order to get this achievement.
(
thanks to @Aloriain for pointing out)
While in the main hub head south to get out of the mountain and enter the town. Head east into a house where a purple crocodile-dinosaur looking creature named Danielle is waiting there.
Talk to her and she'll give you a core and the blacksmith cape which lays on the table. Pick up the core and use the transfer coil which is right next to you.
You need 5,000 Energy and the respective core.
Here is a video which I found helpful.
Credit for the video goes to the creator.