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