Achiuwa was born Sep. 19, 1999 in Port Harcourt, Nigeria. His mother, Eunice, and his father, Donatus, are both Pentecostal ministers. He has three brothers -- God'sgift, God'swill and Promise -- and two sisters -- Grace and Peace. God'sgift played college basketball for St. John's from 2011 to 2014. Precious grew up mainly playing soccer but shifted his focus to basketball in eighth grade, which is when he moved to the United States. During his sophomore and junior years of high school, he played for St. Benedict's Prep in Newark, New Jersey and averaged 18.5 points, 10.5 rebounds, 2.9 blocks and 2.2 steals per game as a junior. He was named to the MaxPreps Junior All-American second team. For his senior campaign, Achiuwa transferred to Montverde Academy, a prep school in Montverde, Florida. There, he averaged 14.0 points and 7.2 rebounds per game, helping the team reach the semifinals at the GEICO High School Nationals. He received various accolades, including USA Today All-USA third team membership. Achiuwa played in the 2019 McDonald's All-American Game, scoring a game-high 22 points, and also played in the 2019 Nike Hoop Summit. He played college basketball at Memphis, where he was named AAC Player of the Year as a freshman, and opted to declare for the 2020 NBA Draft after the season.