Looks pretty awesome.

Some of my levels, namely 12 and 15 so far, are still grey, but I have beaten them. I am on level 19. Why are these levels still grey in the level selection screen if I already beat them, please? And now mission 20 is greyed out, but I just beat it, too! Why is it doing this?...

I never stuck before this level for more then 10 min. Now I've spent about 40, I think.

Hi all I'm not an achievement junkie but I just finished the game and noticed I got all achievements except 'that one'. The one where you have to finish a level without sacrificing anyone. Any tips? which level(s) make that possible?

Even though I have completed some of the requirements for the achievements, none has unlocked.