Question

look at this thesaurus entry:
attain
part of speech: verb
definition: to reach as an end
synonyms: accomplish, achieve, reach, realize
which might someone attain?
your destination on a car trip
a goal

Explanation:

The word "attain" means to reach as an end (or accomplish/achieve/reach/realize). A goal is something that is an end or achievement one works toward, so it fits the definition of what someone might attain. While a destination on a car trip is "reached" in a more physical sense, "attain" is more commonly used for abstract or aspirational ends like goals.

Answer:

a goal