attain vs come across

attain

verb
  • To gain (an object or desired result). 

  • To reach or come to, by progression or motion; to arrive at (a place, time, state, etc.). 

  • To come or arrive, by motion, growth, bodily exertion, or efforts toward a place, object, state, etc. 

come across

verb
  • To produce what was desired; come up with the goods. 

  • To find, usually by accident. 

  • To give an appearance or impression; to project a certain image. 

  • To change sides; to cross over to work for the opposition. 

  • Used other than figuratively or idiomatically: see come, across. 

How often have the words attain and come across occurred in a corpus of books? (source: Google Ngram Viewer )