Here is the full list of all 27 Dark Cards achievements.
Complete the ending "Become A Commodity".
Complete the ending "Planet Destroyer".
Complete the ending "Space War".
Complete the ending "New Life".
Unlock Challenge Mode.
Complete Challenge Mode.
Collect all cards in Story Mode.
Win 10 games.
Pay off your debt.
Control Prima to Defeat the Fox.
Earn more than 100,0000 gold coins in any game mode.
Complete all Levels in Story Mode.
Win every game in Story Mode without losing.
Use an item for the first time in any game mode.
Win three matches with the original deck in Challenge Mode.
Win every match in Challenge Mode without losing.
Defeat yourself in Challenge Mode.
Lost the game by triggering a trap.
Lost the game by triggering an event card.
Deal more than 10 damage at once.
Win using only one type of card.
All cards are flipped over in a battle.
Use a Skill.
Win with only 1 HP left.
Flip your opponent's card for the first time.
Flip 10 traps in one combat.
Run out of cash.