They're hidden achievements. Those that have an icon with four trumpets with banners. They're not normally visible. However, they can be viewed when you first click "View All Achievements" and then "View global achievement stats". There you can see all hidden achievements and their names. But without description unfortunately so who knows how you can get them. For example, there's one called "Heart of Flint" that only 1.4% of players have achieved so the chances of you finding a person who can tell, are small.
Last edited by Totoro; 07-07-2013 at 07:04 PM.
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