Here is the full list of all 38 Ragnarok: The Lost Memories achievements.
Excitement
One Week Goes Fast!
I wish you 77 days of luck.
Go for 222 days
Chapter 1 Clear
Chapter 3 Clear
Chapter 5 Clear
Chapter 7 Clear
Chapter 9 Clear
Ultimate Weapon
Too Much of a Talker
Wandering Assassin
Faithful Priest
Your Job Is
Two Hearts
Riding the Wind
Hammer Down
Bloodshed
Don't Be Swayed
Let's check attendance.
Let's attend for 7 days.
Let's attend for 77 days.
Let's attend for 222 days.
Complete Main Quest "Magic City Geffen"
Complete Main Quest "To Prontera!"
Complete Main Quest "To the Arena!"
Complete Main Quest "Sealed Shrine"
Complete Main Quest "The Return"
Transcend a Soul Weapon to 5 stars
Recruit Ophelia
Recruit Xeno
Recruit Eline
Recruit Xiaolin
Recruit Pauve
Recruit Naki
Recruit Natalie Carma
Recruit Victoria
Recruit Neur