completionism
Completionism is a term used to describe a drive to finish every component of a task, project, or body of content. It is often associated with thoroughness and a desire for finality, and it sits within broader discussions of motivation, perfectionism, and conscientiousness. Some view completionism as a virtue that promotes high standards and durable results, while others see it as potentially rigid or maladaptive when it hinders pace or creativity.
In gaming culture, a completionist is a player who aims to exhaust all content in a game:
In other domains, completionism can describe the aspiration to assemble a complete, self-contained set of elements