Cuphead: New DLC Achievements Guide

To complete this achievement, you need to defeat the boss royal glove on the 4th island

For “A Horrible Night to have a Curse” achievement you need to go to the cemetery location near Doggone Dogfight boss, talk to the ghost near the tree, then press your “Interact” button near graves of the 1st, 3rd and 9th ghost. The ghosts will fly away. There will be an option to go to sleep now, enjoy the secret boss and an achievement after you manage to defeat him and talk to the ghost again
The DLC’s Graveyard puzzle is different every playthrough. Talk to the mountain climbing toons, their positions and speech will tell you what gravestones you need to select and in what order.
Thanks to this guy:and this guy: 

To get it, we need to take a buff for 2 additional hearts and then start spinning after that you will get dizzy and a genie will appear, he will say you were dizzy and double in your eyes and your lives will split and there will be 9 lives.

To complete this achievement, you need to kill the boss from 4 islands without killing his minions

For this achievement, it is necessary to pass any boss 4 islands for an S score

For this achievement, you need to go through all the bosses of the 4 islands and take the ingredients for the cake from them, which will free Miss bowl from the astral

For this achievement, you need to pass all the bosses on the 4th island for A grade of A or higher

For this achievement it is necessary to defeat all the minions of the king of games

For this achievement, you need to defeat any boss with one of Porklind’s new weapons
P.S Porklind is a shop assistant

To get this achievement, you need to kill any boss For the Misis bowl with a super ability

For this achievement, you need to defeat 10 bosses for the misis bowl

To complete this achievement, it is necessary to defeat any boss for the misis bowl

For this achievement, you need to pass all the bosses on the 4th island

I don’t know for sure, but I think that for this achievement you need to either pass all the bosses of the 4 islands (and possibly all the others) at a difficult difficulty level or defeat all the champions of the games on the 4 island without taking damage