completist

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.

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.

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.

The company decided to include every scrap of recorded material, no matter how insignificant. Sometime excerpts were only a few seconds long, with the recording cut off by Parker, the recording engineer, or the producer following a false start, technical problem, or other blatant error. No matter—every flub was issued, available for scrutiny. This completist philosophy was subsequently extended to Parker's other two record companies, Dial and Verve, as well as to his live performances, often captured on amateur equipment in informal settings.

Alternative spelling of completest.