Achievement vs. Completion: What's the Difference?

Achievement and Completion Definitions
Achievement
The process of achieving something
She devoted her life to the achievement of voting rights for women.
Completion
The act of completing or the state of being completed.
Achievement
Something that has been achieved, especially by means of skill or perseverance
The discovery of antibiotics is one of the great achievements of modern medicine.
Completion
(Football) A forward pass that is caught in bounds by a receiver.
Achievement
The act of achieving or performing; a successful performance; accomplishment.
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Completion
The act or state of being or making something complete; conclusion, accomplishment.
Achievement
A great or heroic deed or feat; something accomplished by valor or boldness.
Completion
(legal) The conclusion of an act of conveyancing concerning the sale of a property.
Achievement
(heraldry) An escutcheon or ensign armorial; a full display or depiction of all the heraldic components to which the bearer of a coat of arms is entitled; a funeral shield: the hatchment.
Completion
(American football) A forward pass that is successfully caught by the intended receiver.
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Achievement
(video games) An award for completing a particular task or meeting an objective in a video game.
Finishing the game does not give you a 100% score until you have unlocked all of the achievements.
Completion
(mathematics) The act of making a metric space complete by adding points.
Achievement
The lexical aspect (aktionsart) of verbs or predicates that change in an instant.
Completion
(mathematics) The space resulting from such an act.
Achievement
(sociology) The successful completion of a socially defined goal or task, highlighting individual or group accomplishment.
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Completion
(computing) autocomplete
Tab completion
Achievement
The act of achieving or performing; an obtaining by exertion; successful performance; accomplishment; as, the achievement of his object.
Completion
The act or process of making complete; the getting through to the end; as, the completion of an undertaking, an education, a service.
The completion of some repairs.
Achievement
A great or heroic deed; something accomplished by valor, boldness, or praiseworthy exertion; a feat.
[The exploits] of the ancient saints . . . do far surpass the most famous achievements of pagan heroes.
The highest achievements of the human intellect.
Completion
State of being complete; fulfillment; accomplishment; realization.
Predictions receiving their completion in Christ.
Achievement
An escutcheon or ensign armorial; now generally applied to the funeral shield commonly called hatchment.
Completion
(American football) a successful forward pass in football
Achievement
The action of accomplishing something
Completion
A concluding action