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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
55 3
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
25 4
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
0 0