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