attainment vs achievement

attainment and achievement both are nouns.

Word	Noun	Adjective	Verb	Adverb
attainment	Yes	No	No	No
achievement	Yes	No	No	No

As nouns, achievement is a hypernym of attainment; that is, achievement is a word with a broader meaning than attainment:

Other hypernyms of attainment include accomplishment.

attainment (noun)	achievement (noun)
the act of achieving an aim	the action of accomplishing something
arrival at a new stage
an ability that has been acquired by training