noun (n)

• the act of achieving an aim(noun.act)

  Example:
  The attainment of independence.
  

  source: wordnet30
• arrival at a new stage(noun.act)

  Example:
  His attainment of puberty was delayed by malnutrition.
  

  source: wordnet30
• an ability that has been acquired by training(noun.cognition)

  Synonym:
  accomplishment, acquirement, acquisition, skill
  

  source: wordnet30
• The act of attaining; the act of arriving at or reaching; hence, the act of obtaining by efforts.(noun)

  source: webster1913