foothold vs achievement

foothold and achievement both are nouns.

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

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

foothold: an initial accomplishment that opens the way for further developments
achievement: the action of accomplishing something

Other hypernyms of foothold include accomplishment.

foothold (noun)	achievement (noun)
an initial accomplishment that opens the way for further developments	the action of accomplishing something
a place providing support for the foot in standing or climbing
an area in hostile territory that has been captured and is held awaiting further troops and supplies