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.