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