  We present a unified relaxion solution to the five major outstanding issues
in particle physics: the hierarchy problem, dark matter, matter-antimatter
asymmetry, neutrino masses and the strong CP problem. The only additional field
content in our construction with respect to standard relaxion models is an
up-type vector-like fermion pair and three right-handed neutrinos charged under
the relaxion shift symmetry. The observed dark matter abundance is generated
automatically by oscillations of the relaxion field that begin once it is
misaligned from its original stopping point after reheating. The
matter-antimatter asymmetry arises from spontaneous baryogenesis induced by the
CPT violation due to the rolling of the relaxion after reheating. The CPT
violation is communicated to the baryons and leptons via an operator,
$\partial_\mu \phi J^\mu$, where $J^\mu$ consists of right-handed neutrino
currents arising naturally from a simple neutrino mass model. Finally, the
strong CP problem is solved via the Nelson-Barr mechanism, i.e. by imposing CP
as a symmetry of the Lagrangian that is broken only spontaneously by the
relaxion. The CP breaking is such that although an ${\cal O}(1)$ strong CKM
phase is generated, the induced strong CP phase is much smaller, i.e., within
experimental bounds.
