Top Definition
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
3 more definitions
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
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
A person who tries to collect all of an actor's or artist's work, be it book or recorded medium such as movie or album.
The 1955 version of MY SISTER EILEEN is far from Janet Leigh's best movie, but completionists will want it for her sparkling performance.
by al-in-chgo June 28, 2014

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