This achievement requires three buildings:
- Weapon Workshop (unlocks at 22 dwellers)
- Outfit Workshop (unlocks at 32 dwellers)
- Theme Workshop (unlocks at 42 dwellers)
Building a weapon and an outfit happens soon enough. Simply select a cheap weapon (one that requires a single piece of junk ideally) from the lists of default crafting recipes, and let your worker build them for you.
The theme requires a little more time and effort. To craft a theme, you need to assemble its nine fragments. Such fragments can be found during quest or exploration in the wasteland. They are similar to crafting recipes (blueprints), but they glow briefly once they are acquired. It has been said that theme fragments can be found even before the theme workshop has been built, so there is no need to build the workshop early. There are 8 themes in all, so finding all pieces of a single theme takes a while.
By the time you build your first theme, you will have unlocked the following achievement:
You'll also have made a little progress towards these other achievements: