completionist

[ kuhm-plee-shuh-nist ]

noun

1. (in a video game) a player who attempts to complete every challenge and earn every achievement or trophy:

   I’m not really a completionist, so I skipped the side missions and focused on the main story quests.

2. completist ( def 1 ).

Word History and Origins

Origin of completionist¹

First recorded in 1970–75; completion + -ist

Example Sentences

We think more trades should keep these completionists in mind — not because there’s any inherent advantage, just because it’s fun.

From FiveThirtyEight