When you achieve something, such as a high grade in math or running a mile, you do it successfully.
Capable of being achieved.
The act of achieving or performing; an obtaining by exertion; successful performance; accomplishment; as, the achievement of his object.
Causing mischief; harmful; hurtful; -- now often applied where the evil is done carelessly or in sport; as, a mischievous child.
doing in a way that causes mischief or harm
to accomplish more than is expected
a student who attains higher standards than expected based on the IQ score.
to not accomplish as much as would be expected
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