completist

noun

1. A collector who strives to obtain a complete collection of some type of thing, especially a fan who aims to own or consume the complete output of a particular author, publisher, musician or band.

   “completist - A dope who tries to have a complete collection in some line. The line may be as broad as having all the prozines ever published, or as narrow as collecting all the Golden Atom tales or all official correspondence during one's incumbency in some office. […]”

   “Ozzie Train, secretary. Ozzie needs little introduction, other than that he is the remaining half of Prime Press, and a genuine completist.”

   “There's no new material on it, just previously issued bits and pieces. That rules out the completist collector. Go figure.”

   “But it’s even harder for me, because… I am a completist. Once I start reading an author’s work, I need to read everything that writer has written. I can’t veer away. I need to check all that author’s books off my mental list. My knowledge of their work must be complete.”

   “But in conversations with people who listen at speeds higher than 2x, it became clear that many podfasters are above all, completists. That is, they have an almost obsessive need to listen to every episode of a podcast that they decide to commit to.”

2. A person who champions any philosophy which focuses on the completeness of something.

   “A completist philosopher holds that a definite complete body of knowledge exists to be discovered.”

adj

1. Which attempts to collect something completely.

   “The completist collector of Conan will want not only all the Conan paperbacks, but also those about Conan or using the name Conan to promote sales of other books by Robert E. Howard.”

   “Many collectors have a strong interest in particular artists or genres of music, often combining these with a general collection, but taking a more completist approach.”

2. (alt-of, alternative, obsolete)Alternative spelling of completest.