Primary Twin Adder Achievement

I wouldnt call this a major bug, but I just wanted to report, that although I am finished with my Main-Quest and have done alle the Twin Adder Huntings Logs, I still dont get the first of all Twin Adder (Enlist to the Twin Adder) Achievements. From this achievement down I get all the achievements (do xy levequests for the Twin Adder etc...). Just to be reported.

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