Here is the full list of all 47 BLACK CLOVER: QUARTET KNIGHTS achievements.
Unlock all Achievements
Trained in Mock Battle for a while
Clear another Story
Clear all Story and Challenge Missions
Clear all Challenge episodes
Win a ranked Online Battle match while using Julius.
Win a ranked Online Battle match while using Klaus.
DLC Achievement 9 Description
Win a ranked Online Battle match while using Yuno.
Win a ranked Online Battle match while using Charlotte.
Win a ranked Online Battle match while using Yami.
Win a ranked Online Battle match while using Charmy.
Win a ranked Online Battle match while using Fana.
Win a ranked Online Battle match while using Mars.
Win 10 Online Battle Ranked Matches.
Win a ranked Online Battle match while using Licht.
Win a ranked Online Battle match while using Mimosa.
Win a ranked Online Battle match while using Vetto.
Win a ranked Online Battle match while using Yami (Young Ver.)
Win a ranked Online Battle match while using Vanessa.
First Magic Knight Rank Up
First Film use
Win a ranked Online Battle match while using Luck.
Win a ranked Online Battle match while using Noelle.
Win a ranked Online Battle match while using Magna.
Win a ranked Online Battle match while using Gauche.
Got a Magic Key in Treasure Hunt
Played first Online Battle
Win a ranked Online Battle match while using Asta.
Used a voice line online for the first time
Clear the Charlotte Challenge Episode.
Clear all Mission challenges in Charlotte's Challenge Episode.
DLC Achievement 8 Description
Clear the Julius Challenge Episode.
Clear all Mission challenges in Julius's Challenge Episode.
DLC Achievement 7 Description
Checked Magic Details for the first time
First Title change
First Film change
First Player Icon change
Clear the Story
First Voice change
First time getting a Team Relic
Participated in Zone Control
Participated in Crystal Carry
First Outfit change
First Relic use