Completist

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.

Then a bunch of commercially cynical books […] designed to capitalize on the wise-man status that his death conferred and (in my case successfully) to separate Wallace completists from their money.

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

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.

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.