For unlocking the achievements you must exit the game. Sometimes even twice. Guess you have overtaken it from Two Digits

...so that we can fix them asap.

I downloaded the game using the Linux native Steam client but nothing downloaded (0 bytes). Please fix this or I will request a refund.

Edit: It looks like if you close the window like a normal window, the achievements don't trigger. If you close it with the escape key, they do. I beat the beginner pack, and several other packs (I'm on level 30) but the achievement never popped. I'm running the 64-bit linux native version of the game. My distro is Slackware64-current....

Graphics flicker in and out. Hard to click on anything.