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completist

[kuh m-plee-tist]
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noun
  1. a person who attempts to complete a collection or set, especially a collector who wants to collect an example of every item in a particular field: This recording is a must for obsessive Sinatra completists.I'd only recommend this movie to Hepburn completists.
  2. completionist(def 1).

Origin of completist

First recorded in 1950–55; complet(e) + -ist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for completist

completist

noun
  1. a person who collects objects or memorabilia obsessivelyardent John Wayne completists
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012