completist

listen to the pronunciation of completist
Английский Язык - Английский Язык
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
Which attempts to collect something completely; as, a completist dictionary, a completist collector
A collector who strives to obtain a complete collection of some type of thing
A collector who strives to obtain a complete, or at least a very big, collection of some type of thing