completist
noun
com·plet·ist kəm-ˈplē-tist 
: one who wants to make something (such as a collection) complete
Example Sentences
Recent Examples on the Web True completists, then, must rely on baseball card brokers to track them down. 
Allie Conti, BostonGlobe.com, 16 Feb. 2020 Your best shot at a completist stream is going to be C-SPAN 2, which will show the action on the Senate floor in full. Brian Barrett, Wired, 21 Jan. 2020 Holiday completists will want to see the new holiday version of the Sesame Street parade also. Dewayne Bevil, orlandosentinel.com, 26 Nov. 2019 To attract younger listeners, subscribers to any series can now bring up to two children for free, and $25 student passes allow access to all 18 concerts, which would let completists hear them for just $1.39 apiece. Michael Cooper, New York Times, 18 Oct. 2019 So Leonardo completists who come to Paris with a checklist may be disappointed. Philip Kennicott, Washington Post, 18 Oct. 2019 At this year’s convention, when Han sat down for a panel discussion with fellow YA author and Instagram fashion partnership director Eva Chen, the room was overflowing with delighted Jenny Han completists, ready to applaud at the slightest notice. Constance Grady, Vox, 5 June 2019 Dandelyan Expect a mix of hotel guests—the Mondrian is one of the few high-end spots to stay anywhere in the area—and cocktail completists, pilgrimaging here to sample some of Ryan Chetiyawardana’s drinks. Mark Ellwood, Condé Nast Traveler, 1 Mar. 2018 The list was unquestionably impressive in variety and dramatic range, as fellow completists can attest, especially as brought to life by Mr. Gardiner. James R. Oestreich, New York Times, 22 June 2018 See More
Allie Conti, BostonGlobe.com, 16 Feb. 2020 Your best shot at a completist stream is going to be C-SPAN 2, which will show the action on the Senate floor in full. Brian Barrett, Wired, 21 Jan. 2020 Holiday completists will want to see the new holiday version of the Sesame Street parade also. Dewayne Bevil, orlandosentinel.com, 26 Nov. 2019 To attract younger listeners, subscribers to any series can now bring up to two children for free, and $25 student passes allow access to all 18 concerts, which would let completists hear them for just $1.39 apiece. Michael Cooper, New York Times, 18 Oct. 2019 So Leonardo completists who come to Paris with a checklist may be disappointed. Philip Kennicott, Washington Post, 18 Oct. 2019 At this year’s convention, when Han sat down for a panel discussion with fellow YA author and Instagram fashion partnership director Eva Chen, the room was overflowing with delighted Jenny Han completists, ready to applaud at the slightest notice. Constance Grady, Vox, 5 June 2019 Dandelyan Expect a mix of hotel guests—the Mondrian is one of the few high-end spots to stay anywhere in the area—and cocktail completists, pilgrimaging here to sample some of Ryan Chetiyawardana’s drinks. Mark Ellwood, Condé Nast Traveler, 1 Mar. 2018 The list was unquestionably impressive in variety and dramatic range, as fellow completists can attest, especially as brought to life by Mr. Gardiner. James R. Oestreich, New York Times, 22 June 2018 See More Word History
Etymology
complete entry 1 + -ist entry 1
First Known Use
1951, in the meaning defined above