Accretionary processes are fundamental to our understanding of the thermal and compositional evolution of the Earth and other terrestrial planets in the solar system and beyond. Advances in high-precision isotope/element analyses and theoretical modelling across atomic, planetary and system-wide scales are key to unravelling the early history of rocky, potentially habitable worlds. In particular, processes related to planetary accretion and evolution, such as condensation, impacts, volatilization, atmosphere formation, and core-mantle differentiation have been increasingly constrained by planetary sample analysis, laboratory experiments, theoretical simulations, and astronomical observations of other planet-forming disks. In this session, we invite contributions from any fields that address the various physical and chemical aspects of planetary accretion and differentiation, including geochemistry, cosmochemistry, astronomy, mineral physics, experimental petrology, and planetary sciences.