I played the first level on 1 Dec and the achievement did not unlock. Does the game take into consideration the local time, or the server time? If it's the latter, then timezone differences could explain why it did not unlock for me, even though I correctly solved the minigames ~2h after midnight on 1 Dec....

For this we can have: Dead Cells or Hollow Knight or The Binding of Isaac.

I've played today's day 3 game of sudoku and timed myself. I have definitely completed the puzzle in less than 2 and a half minutes, but the achievement hasn't popped. Is this another glitch? Or is there something I'm missing about the achievement?

I played today's pixel art game in multiplayer, and it unlocked the multiplayer achievement without any issues. However, it didn't unlock the "Complete a pixel art picture". Is this achievement ONLY for completing it in single-player mode?