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