killer King Achievement

I know, but I don't see the killer king achievement in the list of all possible achievements. The achievement after killer queen is random thoughts, and I also don't see it anywhere else in the list...

So there are some achievements like Castle Victory or Killer king, that are considered secret.
I found a good article for you on that subject
https://www.chess.com/blog/Zacian12345/all-secret-achievements-revealed
Enjoy the rest of your day

You need to move the king to another square so that the queen and rook behind can checkmate the opponent.

[Event "NickGT07 vs. red_n0x"]
[Site "Chess.com"]
[Date "2025-05-11"]
[White "NickGT07"]
[Black "red_n0x"]
[Result "1-0"]
[WhiteElo "1362"]
[BlackElo "1349"]
[TimeControl "60"]
[Termination "Victoria de NickGT07 por jaque mate"]
1. Nf3 d5 2. b3 Bf5 3. Bb2 e6 4. Nc3 Nf6 5. d3 Bd6 6. h3 O-O 7. g4 c5 8. Ng5 Bg6
9. f3 Nfd7 10. Bg2 Qxg5 11. Qd2 Qh4+ 12. Kd1 Qf2 13. Bf1 Qg3 14. e4 Bf4 15. Qe2
d4 16. Nb5 a6 17. Na3 Be3 18. Nc4 Ne5 19. Nxe5 Qxe5 20. Bc1 Nc6 21. Bxe3 dxe3
22. Qxe3 Qxa1+ 23. Ke2 Qc3 24. Qd2 Nd4+ 25. Kd1 Qa1+ 26. Qc1 Qc3 27. Bg2 Rfd8
28. Re1 Nb5 29. h4 Rd4 30. h5 Bxe4 31. fxe4 Rxd3+ 32. cxd3 Qxd3+ 33. Qd2 Nc3+
34. Kc1 Nxa2+ 35. Kd1 Qxd2+ 36. Kxd2 Nb4 37. Rc1 Rd8+ 38. Kc3 Na2+ 39. Kc4 Nxc1
40. Kxc5 Ne2 41. b4 Rc8+ 42. Kb6 Nf4 43. Kxb7 Nxg2 44. Kxc8 a5 45. b5 Ne3 46. b6
a4 47. b7 a3 48. b8=Q a2 49. Kc7# 1-0
There’s no killer king