Source : Webster's Revised Unabridged Dictionary (1913)

Achiever \A*chiev"er\, n.
   One who achieves; a winner.

Source : WordNet®

achiever
     n : a person with a record of successes; "his son would never be
         the achiever that his father was"; "only winners need
         apply"; "if you want to be a success you have to dress
         like a success" [syn: {winner}, {success}, {succeeder}]
         [ant: {failure}]