Here is the full list of all 14 Mecho Wars: Desert Ashes trophies - there are 1 bronze, 2 silver, 10 gold and 1 platinum.
Obtain all trophies.
Destroy three units in one turn.
Destroy four units in one turn.
Destroy five units in one turn.
Complete the Winged Uprising episode.
Complete the Winged Assault episode.
Complete the Landian Strikeback episode.
Complete the Desert Ashes episode.
Defeat the AI in a skirmish.
Complete one quest.
Complete five quests.
Purchase five perks.
Purchase ten perks.
Obtain 50000 gold from career quest rewards.