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.
Finish Nightmare Mode.
Defeat every boss in Boss Rush mode.
Recruit every adventurer and finish the game.
Finish the game without sacrificing or recruiting any adventurers.
Go it alone and see the Normal ending.
Sacrifice every adventurer and finish the game.
Adventure with your allies and see the Normal ending.
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.