Here is the full list of all 25 Cards and Castles 2 achievements.
Win 5 multiplayer games as Warlocks.
Win 5 multiplayer games as Ninjas.
Win 5 multiplayer games as Crusaders.
Win 5 multiplayer games as Druids.
Win 5 multiplayer games as Pirates.
Win 5 multiplayer games as Undead.
Raise 10 or more zombies in a single play in a multiplayer game.
Obtain 30 Contraband in multiplayer games.
Win a multiplayer game in 5 turns or less.
Win 5 multiplayer games as Vikings.
Destroy 50 enemy units in multiplayer games.
Destroy 10 or more enemy units in one turn in a multiplayer game.
Deal 10 or more damage with a Trebuchet in a multiplayer game.
Win a multiplayer game while there are 20 or more units on the battlefield.
Win a multiplayer game while your deck has no cards remaining.
Move 100 spaces with dinosaurs in multiplayer games.
Deal 50 damage with Berserk units in multiplayer games.
Deal 20 or more damage in a single attack in a multiplayer game.
Deal 50 or more damage in a single attack in a multiplayer game.
Win a multiplayer game while your Castle has only 1 HP remaining.
Win a multiplayer game.
Win a multiplayer game while your Castle has 25 HP or more.
Defeat 7 practice opponents.
Spectate a multiplayer match.
Complete the prologue.