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a‧chieve‧ment S3 W2

1 [countable] something important that you succeed in doing by your own efforts
His great achievement is to make all the players into a united team.
His great achievement is to make all the players into a united team. somebody's achievement in (doing) something
The test measures children's achievements in reading, spelling and maths.
The test measures children's achievements in reading, spelling and maths.2 [uncountable] when you achieve something or when people achieve something :
Roberts is researching the effect of social class on educational achievement.
Roberts is researching the effect of social class on educational achievement.