Noun
completionist (plural completionists)
A gamer who practices completionism.
I don't come down on any simple place as a deletionist or a completionist. Jimmy Wales
Are you interested in completing all the achievements and grabbing all the cards as part of a completionist run? Source: Internet
For fans who are concerned about having enough time to enjoy the title, it shouldn't take up too much of their time unless they are a completionist. Source: Internet
If you are a completionist, you probably went the extra mile to collect all 900 Korok seeds that are present in to get the seeds aren't hard. Source: Internet