title: Google Play Game Service: show unlocked achievement
body: <p>This might be a stupid question but I havent found an answer to it on Google so its up to you :)</p>
  
  <p>I am using Google Play Service to provide achievements and leaderboards in my android app. I use</p>
  
  <pre><code>unlockAchievement(getResources().getString(R.string.achievement_id));
  </code></pre>
  
  <p>While the achivement is unlocked correctly and is shown in the achievements list it is NOT shown to the user immediately when its unlocked, i.e. the ""achievement unlocked" thingy like in the screenshot below is not beeing displayed:</p>
  
  <p><img src="https://i.stack.imgur.com/7UM4o.png" alt="enter image description here"></p>
  
  <p>Any ideas why this doesn't pop-up? </p>
  
  <p>Thanks in advance!</p>