Extended Reality (XR) technologies are growing in popularity due to their affordability and benefits to different sectors. However, their use raises significant ethical concerns. While most research has focused on specific XR technologies or contexts, there is limited comprehensive exploration of the overall ethical landscape. This study addresses this gap through a Systematic Literature Review, identifying ethical issues such as social implications, privacy risks, and moral dilemmas with XR. These concerns have widespread effects on human life, making it essential to develop ethical and safe XR solutions. This study provides a foundation for future research into each of the ethical challenges identified and emphasizes the need for developing ethical, responsible, and sustainable XR ecosystems.