Achievements are like a collection, almost everyone likes to collect them to have them all, but there are some hidden ones, the number of achievements that are not hidden is 144.
Here I leave how to get the most difficult ones:
1- Full day: 24 hours solving problems
2- Good Habit: Solve daily problems for seven days in a row
3- Man against the machine: You have faced a bot in live chess
4- Winning castling: You have given checkmate with a castling
5- Juggler: Can you play 20 games (daily, otherwise it is impossible) at the same time?
6- Chess marathon: You have played a game with more than 100 moves
7- Finding Bobby Fischer: A seemingly difficult hidden achievement but it is not at all. You have to search in the section... more, Database of chess games, Look for Fischer and in any of his games, press the Practice against the computer button and play a few moves.
8- Good reading: 100 people have read your blog
Then there are 5 others that can no longer be obtained:
- Precious snowflake
- Nutcracker
- Stocking full of gifts
-Jingle Bell
-Holly Berry