Here is the full list of all 28 Card Brawl achievements.
Complete the second Raid
Complete the first Raid
Kill The Werewolf Boss
Kill the werewolf with an empty deck
Kill the werewolf with the poisoner's deck
Kill the werewolf with rush's deck
Kill the werewolf with a standard deck
Banish the paladin from these lands
Kill the paladin with an empty deck
Kill the paladin with the poisoner's deck
Kill the paladin with rush's deck
Kill the paladin with a standard deck
Play an empty deck 3 times
Play an empty deck 5 times
Play poisoner deck 3 times
Play poisoner deck 5 times
Play a deck of rush 3 times
Play a deck of rush 5 times
Play with a standard deck 3 times
Play with a standard deck 5 times
Complete the third Raid
Complete the fourth Raid
Complete the fifth Raid
Play a shaman deck 3 times
Play a shaman deck 5 times
Defeat a werewolf with a shaman deck
Win paladin deck shaman
Complete DLC Raid