hardest with my relatively high ratings was probably 'castle victory', since you are basically giving people castling odds & most people at my level will resign before checkmate anyways.
last one i got was 'puzzle addict' because i was trying to avoid tanking my accuracy percentage.
i've unlocked all 145 achievements... look through my list to see the hidden ones. 🥷
Impressive!! What was the hardest one to get, for you?
And which one was the latest one you got?