  For a given list of closed manifolds $\Sigma_k=(P_1,...,P_k)$, we construct a
cobordism category $\mathbf{Cob}_{d}^{\Sigma_{k}}$ of embedded manifolds with
Baas-Sullivan singularities of type $\Sigma_k$. Our main results identify the
homotopy type of the classifying spaces $B\mathbf{Cob}_{d}^{\Sigma_{k}}$ of
these cobordism categories with that of the infinite loop-space of a certain
spectrum, $\mathsf{MT}_{\Sigma_{k}}(d)$. Our results generalize of the work of
Galatius, Madsen, Tillmann, and Weiss from arXiv:math/0605249. It also
generalizes the work of Genauer on the cobordism categories of manifolds with
corners from arXiv:0810.0581.
