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