Here is the full list of all 27 KAMIKO achievements.
Cleared playing Yamato
Cleared The Ruins of Yamataikoku
Found secret item Doll
Cleared The Scorching Labyrinth
Cleared The Sunken Relics
Cleared The Forest of Awakening
Opened 4 gates between worlds
Broke a seal to a gate between worlds for the first time
Defeated 15 enemies in one stage
Pressed the switch to open the first door
Unleashed all 3 of the playable characters' Special Attacks in one save data
Chained 100 combos
Found secret item Sushi
Found secret item Hamburger
Found secret item Crow
Have a playable character with max stats of HP12 and SP400
Cleared playing Uzume
Cleared playing Hinome
Killed 3000 enemies in one save data
Destroyed 1500 objects in one save data
Cleared game within 30mins
Cleared the game within 30mins for each of the 3 playable characters within the same save data
Found all secret items within the same save data
Unlocked Sound mode
Didn't use Continue to clear the game
Cleared the game with no damage
Unlocked all Achievements