the most difficult achievements

“Silicon Brain”, about 300 Drills to finish. I have done 126 drills and there are 184 drills to do.

im getting the post achievement with this

i got castle victory and killer king

i also have nick of time

same

k

I delivered mate by castling and I don't see that in my achievements. Not even as a blank.

its a hidden achievement

l Got puzzle machine!

(100 puzzles in 2 hours)

But the hardest is puzzle addict. (10000 puzzles correctly solved)

I somehow got full house and nick of time and didn’t notice which games. 
to get nick of time, I possibly used a pre-move in bullet or blitz.

getting full house is probably the easier of the two.

edit/ try get a checkmate in under ten moves to get full house.