This study investigates the use of chitosan-alkyl polyglucoside (APG) mixtures as environmentally friendly ingredients in 2-in-1 shampoo formulations. For this purpose, experiments were performed by varying the surfactant concentration and ionic strength at a fixed chitosan concentration. The results show that chitosan–APG mixtures exhibit a phase diagram strongly influenced by APG concentration. At constant chitosan concentration, two different types of regions emerge: one characterized by the formation of transparent mixtures at low and high surfactant concentrations, and another with turbid mixtures at intermediate concentrations where no macroscopic phase separation was observed. These turbid mixtures result from a coacervation process that is critical for the formation of conditioning deposits. The ionic strength affects the phase transition, causing shifts from transparent mixtures to coacervates and back at lower APG concentrations, although the overall phase behavior remained qualitatively similar. Chitosan–APG mixtures promote the formation of conditioning deposits via coacervate deposition. When the system reached the coacervation region, deposition increased significantly regardless of ionic strength. This finding is critical to the development of effective hair care products and demonstrates the potential of these mixtures to provide conditioning benefits comparable to traditional formulations. In summary, this research enhances the development of sustainable and natural cosmetics while addressing key scientific questions about biopolymer behavior under varying conditions.