There’s an entire blog dedicate to this: https://www.chess.com/blog/idk13243/all-secret-achievements-and-how-to-get-them
Chess.com secret achievements
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eh, there are many achievements, some don't work, some are really hard to get, but I found 5 and some that you might have not heard of. there's Precious snowflake, another for beating santa the bot, castle victory, searching for Bobby Fischer and Killer king. tell me If there's more