Steam Bestiary achivement isn’t activated although I killed the last one (Shade of Belevros) in endless Arena. Is there anyone else here with the same problem? How can I fix it?
Just before concluding that it’s a bug, did you “Fill up the knowledge bar for all beasts”? 
Thanks. I thought all beasts’ knowledge bars are already full as their image is active. I got the achivement after completing 2 beasts’ bars.
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Cool! You are welcome!