Here is the full list of all 22 Mon-Yu: Defeat Monsters And Gain Strong Weapons And Armor. You May Be Defeated, But Don't Give Up. B achievements.
Oh! You put Devil King Freyr in his place, and returned Mjolnir to the Queen!
Ho ho! You put down Devil King Fenrir, and returned Mistilteinn to the Queen!
Heroes! You defeated Devil King Hel and returned Gjallarhorn to the Queen! No one can claim your nails!
In the arena, sweat flew, muscles crashed, and in the end you overcame Devil King Surtr! Huzzah! You returned Laevateinn to the Queen.
Ho ho! Heroes! You have brought an end to Devil King Norn! ...Who was that, again? You returned Brisingamen to the Queen.
Oh brave heroes! You timed your attacks well and crushed Devil King Jormungandr! You returned Sleipnir to the Queen.
Heroes, you defeated the nasty Devil King Loki! Heroes, you defeated the dastardly Devil King Loki! Heroes, you defeated the clever Devil King Loki! That was exhausting, wasn't it? You returned Gungnir to the Queen.
Heroes! You defeated all the Minor Devil Kings and gathered all of the Einherjar fragments! I knew you were the true heroes!
{...Ho ho! Brave heroes!...} {...You have done it!...} {...You have defeated the True Devil King and saved the Land of Fairies!...}
Ho ho! You found your first Map Beetle! Make the most of its magic!
Oink! You found your first Scarab Beetle! I'll take it, please! Hyoink!
Oh! It seems like you've collected a great deal of stuff on your adventure! You established yourself as a collector of D-rarity weapons and armor.
Ho ho! It seems like you've collected a great deal of items on your adventure! You established yourself as a collector of C-rarity weapons and armor.
Heroes! It seems like you've collected a great deal of rarities on your adventure! You established yourself as a collector of B-rarity weapons and armor.
Brave heroes! It seems like you've collected a great deal of precious items on your adventure! You established yourself as a collector of A-rarity weapons and armor.
You have done it brave heroes! It seems like you've collected a great trove of wonderful treasure on your adventure! You established yourself as a collector of S-rarity weapons and armor.
You cleared a dungeon with a D rank.
Oh! You cleared a dungeon with a C rank. Well done!
Heroes! You have cleared a dungeon with a B rank. Thank you for all your help!
Brave heroes! You have braved your way though and cleared a dungeon with an A rank. There is hope for the land of Fairies!
My heroes...! You have mustered all your courage and cleared a dungeon with an S rank. You will surely save the Land of Fairies!
My heroes... You have obtained all the achievements! I shall compose an epic of your deeds. It shall be passed down through generations until the end of time.