Learn English – Phrase to describe person who seeks 100% achievements in game

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After completing a mission or beating a game, an achievement or trophy will pop up. How do I describe such a person who sticks with it, to unlocking all the achievements of a game, no matter what time or effort is required?

I've considered achievements maniac or achievements addictor?

Other options?

EDIT: I mean to describe someone's personality. That kind of person maybe take too much time on beating challenges in game but never get bored – sort of perfectism and obsession. The word or phrase needs to be considered derogatory.

Best Answer

In the context of video games or people who collect sets of things, the perfect word would be completionist — if it weren't for the fact that you're looking for a word with derogatory connotations.

Derogatory phrases for things related to completionism — collecting things and interest in storytelling, for example — would be

  • magpie: compulsive and not very discriminating collector of shiny things. "used figuratively to refer to a person who obsessively collects things or who chatters idly".
  • trainspotter: Someone who pays obsessive attention to details about trains, or by extension to any hobby which is not broadly accepted by society. "a person who obsessively studies the minutiae of any minority interest or specialized hobby".
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