I've found all 80/80 animals, and 11 out of the 12 achievements popped, but there's one still locked. Is there some secret to getting the final achievement, or is there a bug?

Just played through the game, and had 75 of the animals found without even using the zoom feature I had wondered about being "missing", until I finally noticed the +/- icons in the top right HUD. Why I missed the zoom was primarily because I tried the mouse wheel, and that did not work, so I "gave up". IMO, it would be good to add zoom to the mouse wheel , additionally. I am not a huge fan of the scroll arrow icons that let you navigate the image. Personally I would have prefer...

I have problems to find the last animal. For picture comparsion I would need a common resolution of 1920x1080

As the title says, Specifically 3440x1440p

I had problems in running this game: it didn't start and I was forced to ask a refund. Now I've changed my video card (Nvidia GTX 750), I would like to know whether I could be reasonably sure the game starts (I'm a fan of this game genre) and buy it again....