I love it, thanks for your hard work!
I would personally add two achievements for what I think are the most missed puzzles:
Stay hydrated (Complete the 8*8 Water Drop puzzle)
BEHIND the counter (Complete the 8*8 Skull puzzle)
I also personally would prefer [Annoyed burbling] for acquiring the Crab's Fish Power, but that's a matter of taste.
I personally found the 12 * 12 Grapes puzzle to be the hardest puzzle in the game, if there was an achievement for them specifically, I'd name it 'OF WRATH'
In any case, good job putting these in!