noun

• The act of achieving or performing; a successful performance; accomplishment.
• A great or heroic deed or feat; something accomplished by valor or boldness.
• (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; (now especially) a funeral shield: the hatchment.
• (video games) An award for completing a particular task or meeting an objective in a video game.
• (grammar, semantics) The lexical aspect (aktionsart) of verbs or predicates that change in an instant.
• (sociology) The successful completion of a socially defined goal or task, highlighting individual or group accomplishment.