Sigmund Freud was one of the most famous psychologist and sexologist in the 20th century. His achievements and influence were very extensive. Here are some of his achievements: Achievement: He was one of the founders of psychoanalysis. He proposed the concepts of "subconscious" and "psychological defense mechanism", which laid the foundation for later psychology. 2. Contribution to sexology research: Freud made an important contribution to sexology research. He proposed the concepts of "sexual instinct" and "sexual repression" and developed the concept of "subconscious", which laid the foundation for sexology research. 3. Impact on clinical practice: Freud had a profound impact on clinical practice. His theories and methods were widely used in psychotherapy and clinical practice. Something that would have a profound impact on future generations: 1. Psychoanalysis: Freud's psychoanalysis had a profound impact on later psychology and clinical practice. His concepts and methods were widely used. 2. Sexology research: Freud's contribution to sexology research cannot be ignored. His concepts and methods laid the foundation for sexology research. 3. Impact on human culture: Freud's ideas and methods had a profound impact on human culture. He emphasized the role of the human subconscious and had an impact on later culture and art.