Quote:
Play one game of StarCraft II in any online mode before 11:59 p.m. PDT on April 17. (1 Remaining)
Beginning March 31, play one Arcade, Custom, Ranked, Training, Unranked, or Versus A.I. game to earn the StarCraft 15-Year Anniversary Feat of Strength achievement. As soon as you've received the achievement, all three portraits will be permanently unlocked in your StarCraft II character profile.
In celebration of 15 years of SC. Easy achievement for anyone who hasn't gotten it. Good until Apr. 17.