Here is the full list of all 66 共鸣 ReMix achievements.
Complete difficulty 0 with any hero
Complete difficulty 1 with any hero
Defeat 100 musical monsters in total
Defeat 500 musical monsters in total
Defeat a total of 1,000 rhythm monsters
Defeat a total of 2,000 rhythm monsters
Defeat a total of 4,000 rhythm monsters
Kill 500 monsters in a single game
Kill 1,000 monsters in a single game
Kill 1,300 monsters in a single game
Kill 1800 monsters in a single game
Kill 100 monsters in a single game
The team reaches level 5 in a single game
Win a game with Charlie
Win a game with Amaya
The highest quality harmonies join the band
Completed 5 waves of battles in total
Completed 15 waves of battles in total
Completed 30 waves of battles in total
Unlock 1 echo clue
Unlock 5 echo clues
Complete difficulty 2 with any hero
Complete difficulty 3 with any hero
Complete difficulty 4 with any hero
Complete difficulty 5 with any hero
Defeat a total of 8,000 rhythm monsters
Defeated a total of 10,000 rhythm monsters
Defeat a total of 12,000 rhythm monsters
Defeat 15,000 musical monsters in total
Kill 2,000 monsters in a single game
Kill 2,500 monsters in a single game
Kill 4,000 monsters in a single game
Get 2000 money
The team reaches level 20 in a single game
The team reaches level 25 in a single game
The team reaches level 30 in a single game
Have 1000 money
Win a game with Akash
Win a game with Freddie
Win a game with Paul
The highest quality Aeolian joins the band
Dorian of the highest quality joins the band
The highest quality Locria joins the band
Lydian of the highest quality joins the band
The highest quality melodies join the band
Mixolydian of the highest quality joins the band
The highest quality Phrygian joins the band
The highest quality Rhythmia joins the band
The highest quality Tempo joins the band
The highest quality Legato joins the band
The highest quality Allegro joins the band
Completed a total of 75 waves of battles
Completed a total of 150 waves of battles
Unlock 10 echo clues
Unlock 20 echo clues
Unlock 35 echo clues
Complete all achievements
Unknown
Complete difficulty 5 with Octavia without equipping any Relic.
Complete difficulty 5 with Amaya without equipping any Relic.
Complete difficulty 5 with Akash without equipping any Relic.
Complete difficulty 5 with Freddie without equipping any Relic.
Complete difficulty 5 with Paul without equipping any Relic.
Complete difficulty 5 with Doctor Akash without equipping any Relic.
Complete all expert level achievements.