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Kobold Breath does not list any prerequisites, but it talks about your draconic exemplar:
You channel your draconic exemplar's power into a gout of energy that manifests as a 30-foot line or a 15-foot cone, dealing 1d4 damage.
I have not found draconic examplar mentioned in Kobold Heritages. Should this mean, anyone with Adopted Ancestry can learn breath fire? Seems a bit counterintuitive.
Draconic Exemplar is a special ability that all kobolds have, described in their main entry details. A character without that ability wouldn't qualify for the feat, so other characters of other ancestries would not be able to take it.
Another good reason why this wouldn't work is that Kobold Breath has different effects depending on the character's Draconic Exemplar, with no catch-all for some typeless breath weapon. What effect a non-kobold with Kobold Breath would generate would be entirely up to the GM, if they chose to allow it anyways.
But I would tend not to allow it, unless someone came up with a truly compelling justification.
An adopted ancestry means just that-- you're an honorary kobold by virtue of having been adopted into the culture. Whether that means actually being adopted at birth or as a child and raised among kobolds, or having joined a tribe years ago and been fully accepted and acclimated into it, or something similar. You are therefore allowed to take ancestry feats from any actual ancestry you have, and any ancestry feats from the adopted ancestry as long as your body will support them:
You’re fully immersed in another ancestry’s culture and traditions, whether born into them, earned through rite of passage, or bonded through a deep friendship or romance. Choose a common ancestry. You can select ancestry feats from the ancestry you chose, in addition to your character’s own ancestry, as long as the ancestry feats don’t require any physiological feature that you lack, as determined by the GM.
The emphasis is mine, and it's in two parts:
Some of the Kobold Feats are pretty clear that they need kobold bodies to support them:
Winglets: "You're among the few kobolds who grow a set of draconic wings later in life...." (Emphasis mine)
Hatchling Flight: Requires Winglets
Wyrmling Flight: Requires Hatchling Flight
Kobold Breath, unfortunately, is not so clear cut. It comes down to whether or not the GM considers the Kobold Breath as something inherently dependent on kobold physiology that some kobolds are born with, or whether it's more of a spell-like effect when anyone with any body plan can learn.
The latter position, though I also find it counter-intuitive, can be supported by noting that the Kobold's Breath feat has the Arcane and Evocation tags as well as the Kobold Tag.
But the emphasized text from the Adopted Ancestry text, in my opinion, trumps all: It is, per the rules as written, explicitly a GM call.
