Here is the full list of all 18 Chess, but... achievements.
Play 100 en passants
Play 30 en passants
Play the Sicilian dragon opening
Make Stockfish crash
Lose 10 games and ragequit
A En Passant gets played within the first 10 moves
Play the tennison gambit: Intercontinental ballistic missile variation
Move your knight 5 time in a row
Lose a game
Win 5 games in a row
Play the queen's gambit
Blunder your queen
Play the ███cloud attack opening (e4, e5, Ke2) in one of your games
Deliver a checkmate to one of your opponents
Promote a pawn
Your opponents plays en passant
Beat all challenges, positions and mysteries on every difficulty
Beat all challenges, positions and mysteries on 1 difficulty