Here is the full list of all 20 Ruvato: Original Complex achievements.
Play for the first time
Defeat 10 enemies
Defeat 100 enemies
Defeat 500 enemies
Dash 100 times
Parry 20 times
Cyborg Ria
Clear Chapter 1
Clear Chapter 2
Clear Chapter 3
Clear Chapter 4
Clear Chapter 5
Meet Ai
See Epilogue
See Prologue
Obtain over 20 or more ATK
Try 100 times
Clear all stages with A Rank
Master all skills
Not that way!