completionist

American  

[kuhm-plee-shuh-nist] / kəmˈpli ʃə nɪst /

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.

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Etymology

Origin of completionist

First recorded in 1970–75; completion + -ist

Example Sentences

“I get enjoyment out of being a completionist,” Hammers, 24, said in a recent interview.

From New York Times

Siobhan Adcock is a writer and editor whose most recent novel is The Completionist.

From Scientific American

I’m not a big enough Resident Evil completionist to fill those guides, but I got the palpable sense of watching something where the creators were showing their homework to gain viewers’ trust.

From The Verge

While pretty much everyone I spoke to mentioned ways in which they could get away with reducing the physical workload, it’s important to note that tests that involved completionist achievements or high difficulties would usually require traditional testing.

From The Verge

And like a few other “Animal Crossing” super users The Washington Post spoke to, Smith considers himself a completionist.

From Washington Post