Here is the full list of all 16 Cards and Castles achievements.
Lose a multiplayer game. It's ok, really!
Win 3 or more matches in a single draft.
Disenchant a card!
Collect 5 legendary cards.
End a turn with at least 6 buildings in play.
Deal 1000 total damage from attacks.
Win a multiplayer game.
Unlock all 5 factions.
Deal 10 or more damage in a single attack.
Collect at least one legendary card!
Destroy the enemy castle while the opponent has no units in play.
Craft 10 cards!
Craft one card using shards.
Win 10 multiplayer games.
Win a game with only 1 health left on your castle.
Craft 50 cards!