Here is the full list of all 39 Onee Chanbara ORIGIN achievements.
Cleared all Chapters in the story
Cleared the story difficultly "Hard"
Defeated Lei (Berserk) in the story
Defeated Eva in the story
Defeated Oboro (Xtatic) in the story
Defeated all types of awakened zombies
Defeated Anzu (Berserk) in the story
Defeated Death Bear in the story
Defeated Ubie's second form in the story
Defeated Lei in the story
Swapped with Saki for the first time in the story
Defeated Saki in the story
Went Xtatic for the first time in the story
Used Cool Finish a total of 100 times
Defeated Sayaka in the story
Defeated Devda in the story
Went Berserk for the first time in the story
Cleared Chapter One of the story
Performed a successful parry for the first time
Acquired all other Achievement
Reached level 99 with Aya
Reached level 99 with Saki
Reached level 99 with Aya and Saki
Went Berserk 100 times
Went Xtatic 100 times
Cleared Infinite Survival floor 8 without having taken any damage
Cleared Infinite Survival Mission floor 23 without having taken any damage
Cleared Infinite Survival floor 31 without having taken any damage
Cleared Infinite Survival floor 51
Acquired 1,000,000Z
Obtained all rings
Obtained all consumable items
Completed 5 quests
Performed 5 consecutive successful parries against a single boss
Performed 10 consecutive successful parries against a single boss
Equipped two characters with the same type of ring
Investigated all of the Goddess Statues that appear in the story
Cleared the story difficultly "Beast"
Cleared the story difficultly "Berserk"