Completionist 

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.

Completionist by Cobbbler May 1, 2010

Completionist 

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!

Completionist by AkuKnives October 13, 2014

Completionist 

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

Completionist by AIDSLOL October 21, 2010

completionism

An overwhleming urge to find every collectible of a set or complet a game to 100%. Often associated with being a completionist.

My completionism led me to find every flag in Assasin's Creed

completionism by Catdrewz July 3, 2016

Complexionist 

A complexionist is someone who dislike any complexion other than his or her complexion

I don't like people that are fair in complexion and I don't care if you call me a complexionist

Complexionist by El-Eureka Darlington May 11, 2018

Complexionist 

Complexionists believe in complexionism. The idea that life is determined by complex processes and that the purpose of humankind is to research and discover these processes and make best use of it for our survival

Dude, your idea to apply biology to computing is such as complexionist thing!

Complexionist by Notura July 7, 2011

Completionist 

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.

Completionist by OJSizzle February 24, 2017