Phrase to describe person who seeks 100% achievements in game

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.

Solution 1:

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".

Solution 2:

In video-game circles, the unfortunate phrase achievement whore seems to be used rather often.

Precise usage varies. Occasionally the phrase will be used for somebody who simply tries very hard to gather all achievements in a given game. More frequently, however, it is used to denote somebody who buys and plays new games purely to gather more achievements, when they would not otherwise have considered playing said game.

Solution 3:

I would consider this person driven / achievement-driven: very determined to succeed; having a compulsive or urgent quality; propelled or motivated by something; used in combination results-driven.

likewise determined: having a strong feeling that you are going to do something and that you will not let anyone or anything to stop you.

consider resolute: marked by firm determination

All three connote some character quality of stick-to-itiveness, willpower, constancy, steadfastness, doing what you are supposed to do. They are not negative in the manner of addicted, compulsive or obsessive, which can also be used to describe determined gamers.

Edit: compulsive: characterized by perfectionism, rigidity, and an obsessive concern with order and detail.

**perfectionist: one with propensity for being displeased with anything that is not perfect or does not meet extremely high standards.

Or obsessive: motivated by a persistent overriding idea or impulse, often associated with anxiety; continually preoccupied with a particular activity, person, or thing.