Someone who, when playing a video game, has to collect all of a certain item, or complete something in the game 100%.
Only a completionist would collect all of the flags in Assassin's Creed.
by Cobbbler May 01, 2010
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An individual who frequently strives to have a complete set of something, regardless of whether or not the individual pieces have any importance or value.
Boy: I've almost caught every single Pokémon!
Girl: Aren't there like 700 something now? You can't possibly raise them all.
Boy: Yeah, but I HAVE to catch them all!
Girl: Ugh, you're such a Completionist!
by AkuKnives October 13, 2014
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A person who feels compelled to attain every possible acheivement in whatever video game they play.
I got bored with this game ages ago but I'm a bit of a completionist, so I'm playing it on a harder difficulty level
by AIDSLOL October 19, 2010
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A person who feels It is a necessity to obtain or achieve everything despite its INSIGNIFICANT value. They feel the need to turn everything into a collection from Disney figurines to sexual encounters with peers.
Peer: I'll give you a twenty bag to suck my dicc out here in the hundred acre woods
Robbie: *Muffled gagging noises*
Pooh: Oh bother!

Piglet: He can't help it, he's a completionist.
by OJSizzle February 24, 2017
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A person who feels It is a necessity to obtain or achieve everything despite its significant value. They feel the need to turn everything into a collection from sexual encounters with children to snuff films
Luke: Aidan why have you stolen all Zacs chromosomes he can't function without them
Aidan: I can't help it I'm a completionist
by Melman Mankiewicz February 22, 2016
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