Here is the full list of all 15 Bloodstained: Curse of the Moon achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Go it alone and see the Normal ending.
Adventure with your allies and see the Normal ending.
Defeat every boss in Boss Rush mode.
Finish Nightmare Mode.
Sacrifice every adventurer and finish the game.
Finish the game without sacrificing or recruiting any adventurers.
Recruit every adventurer and finish the game.
Finish Stage 8 for the first time.
Finish Stage 7 for the first time.
Finish Stage 6 for the first time.
Finish Stage 5 for the first time.
Finish Stage 4 for the first time.
Finish Stage 3 for the first time.
Finish Stage 2 for the first time.
Finish Stage 1 for the first time.