completist

Definition from Wiktionary, a free dictionary

[edit] English

[edit] Noun

completist (plural completists)

1. A collector who strives to obtain a complete, or at least a very big, collection of some type of thing
2. A person who champions any philosophy which somehow includes the completeness of something; as, a completist philosopher who holds that there is a definite complete body of knowledge to be discovered

[edit] Adjective

completist (not comparable)

1. Which attempts to collect something completely; as, a completist dictionary, a completist collector