Here is the full list of all 13 War Theatre: Blood of Winter trophies - there are 2 silver, 10 gold and 1 platinum.
Obtain all trophies.
Defeat the AI in a Skirmish game.
Purchase ten perks.
Purchase five perks.
Purchase one perk.
Obtain 25000 gold from career quest rewards.
Complete ten quests.
Obtain 10000 gold from career quest rewards.
Complete five quests.
Destroy five units in one turn.
Destroy four units in one turn.
Destroy three units in one turn.
Complete one quest.