No missable achievements (plus 24 unknown)
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Earn a survivor medal.
Earn a defender medal.
Earn a strategist medal.
Completed an optional skirmish.
Completed a quest.
Completed a mission in less than 90 seconds.
Used soul absorption on a fallen spirit warrior.
Beat a skirmish level with a card to spare.
Completed the Direct Trail.
Purchased all the might skills.
Completed a battle with only archers.
Completed a battle without building any troops.
Completed the Frozen Country Trail.
Purchased all the martial skills.
Purchased all the magic skills.
Completed all skirmishes.
Completed the Ancient Forest Trail.
Found all the artefacts.
Completed the final battle against the cats.
Completed the final battle against the dogs.
Completed all Missions.
Earned every strategist medal.
Earned all medals.
Earned every defender medal.