Besides yellow (cultivated I think) and white (wild I presume), there are various new hybrid shades including purple/deep pink achillea and the ferny leaf would prove my point--probably. (I think I've finally killed mine off--no tears--pretty but worthless for drying or other uses IMHO!) If it's a mass of tiny flowers, your source may be right.
goatlady is correct: bee balm is a very different creature--erect stiff stems with real leaves and feathered flowers with a distinct odor when you rub any part of them (at least on those I grow) and often encounters powdery mildew. Echinacea looks like daisies with a hard brown center (usually).
If it's achillea, pick it and enjoy it in a nice vase or let it stay to brighten your path...
katy