So I just ran through the game in expert mode, but I didn't unlock the achievement for it. Did I do something wrong?

As of now, if you try to start Abyss: The Wraiths Of Eden using MacOS Catalina, you get the message: “Abyss: The Wraiths of Eden.app” will damage your computer. You should move it to the Trash. This file was downloaded on an unknown date. This issue persists if you uninstall and reinstall via Steam....

I've been trying to get the achievemnt "GAME, SET, MATCH" for some time now, no luck. Played through both the main game and the extra content multiple times, but according to the ingame-list there's still one domino game missing (21/22). What is it I'm missing?...

I bought the game a couple months ago but downloaded it yesterday, and when I tried to open it my Macbook immediately suggested I put it in the bin because it was gonna damage my computer. It's never suggested that before with any software. Has anyone with MacOS encountered a similar problem?...

Call me weird, but if it comes to HO games I like unlocking all achievements. When I realised I have to finish the game twice to unlock everything I got discouraged and have never given the game a chance. I hope you won't make the same mistake in future games....