verb (used with object) to reach, achieve, or accomplish; gain; obtain: to attain one's goals.

at·tain (ə-tān′) v. at·tained, at·tain·ing, at·tains v.tr. 1. To gain as an objective; achieve: attain a diploma by hard work. 2. To come to or arrive at, as through movement, growth, or the passage of time: Redwoods can attain a height of 300 feet.

attain /əˈteɪn/ vb (transitive) to achieve or accomplish (a task, goal, aim, etc) (transitive) to reach or arrive at in space or time (intransitive) often followed by to: to arrive (at) with effort or exertion

attain (third-person singular simple present attains, present participle attaining, simple past and past participle attained) (transitive) To gain (an object or desired result).