Here is the full list of all 38 Meltys Quest achievements.
Defeat D.M.U. on True Princess mode without retreating during the fight.
Defeat the final boss on True Princess Mode.
Obtain the sword of a king.
Face the first boss of True Princess Mode.
See all six endings.
Defeat the secret boss on True Princess Mode.
View the hidden ending.
Let Dark Pietra defeat herself.
Defeat Dark Lilf while wearing an Apron.
Mano a Mano Defeat Dark Limey using only Strike skills, Guard or Items.
Defeat Dark Globbers while only using Love Shot or Love Wave to do damage.
Got Milk?
Oh hey, didn't see you there.
Defeat the final boss while only using Love Shot or Love Wave to do damage to the final boss.
Obtain the secret outfit.
Achieve bliss a total of 100 times or more.
Learn a Skill from using an Item.
Give life twenty times.
Complete the rebuild of Castle Rothstein.
Wear only what you were born with.
Wear Melty's new favorite battle outfit.
Help someone prepare for their graduation.
Pick the fourth option while talking to Zanelli.
Read Garnet's letter.
Defeat a chicken. Wow.
Get the Pure Ending while in Princess Mode.
Slay a relic of the past.
Wear the JK Clothes.
Time to kick some butt!
Save the world.
Pointless, useless, futile, meaningless.
Have exactly 7 in all three cream related experiences.
Cannonball!!
Meet the wandering swordsman while having done the oldest profession in the game five times or more.
Wear the Nurse Uniform.
You lost on purpose didn't you.
Mine an iron ore.
Give the Red Potion to Rudolf.