Full list of all 26 Dandy Ace achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox One.
Unlock half of all Cards
Defeat Lele on Hard difficulty
Unlock half of all Nnif's upgrades
Unlock half of all Trinkets
Finish every level in the game at least once
Get all four Keys
Collect half of all Blueprints
Defeat Lele on Normal difficulty
Beat the Outside Path of the Palace (Courtyard, Garden, Scissorella, Labyrinth)
Defeat Scissorella
Defeat Severino
Beat the Inside Path of the Palace (Banquet Hall, Art Gallery, Axolangelo, Guest Lounge)
Unlock half of all Jolly Jolly's upgrades
Defeat Axolangelo
Get the Red Key
Unlock the upgrade Tea Potion Sachet 1
Defeat Lele on Very Hard difficulty
Defeat Lele on Nightmare difficulty
Collect all Blueprints
Unlock every Yellow Card
Unlock every Blue Card
Unlock every Pink Card
Unlock all Cards
Unlock all Trinkets
Unlock all of Jolly Jolly's upgrades
Unlock all of Nnif's upgrades