Stucked at 99% game completion.

Hello there!

 I am lost. I have stuck at 99 % game progress after finishing it and am not able to find anything else to discover. I do have all the collectibles from chests, all the secrets found, all the areas explored, all database entries filled, even all the plants for terrarium gathered…

 Could anybody help me? Is it a bug or did I miss something?

 Thanks for any advice in advance.

Rodann