andreyin In the "app admin" page for your game there's a tab called "Stats + Achievements", I think you have to manually add in "New Achievements" through that. Did you add them in there before you tried? I'm guessing you just reference the achievement name?
I have added the achievement there, but I'm not sure what I should put in the action in C2. It says to add the "achievement name" but the options I have are the ID (1/0), API name (s1) and display name (Secret 1).
Edit: I had to use the API name. I got it to work. Thanks a bunch for this!!