Here is the full list of all 35 Brigandine The Legend of Runersia achievements.
Clear all Lands of Distorted Mana Showers.
Clear 5 Lands of Distorted Mana Showers.
Register all events in the Records of History.
Clear Main Mode as the Republic of Guimoule.
Clear Main Mode as the Norzaleo Kingdom.
Attempt Challenge Mode for the first time.
Clear Main Mode as the Shinobi Tribe.
Register 20 event types in the Records of History.
Clear Main Mode as the Mana Saleesia Theocracy.
Choose to suppress the Incarnation of Rune.
Clear the game on Hard Mode.
Clear Main Mode as the United Islands of Mirelva.
Clear a Land of Distorted Mana Showers for the first time.
Deal 500 or more damage to an enemy unit in a single attack.
Equip any knight or monster with items that trigger a 3★ set bonus while playing Main Mode.
Activate the maximum number of elements (9) for any knight or monster.
Register 10 event types in the Records of History.
Invade an enemy base from two or more sides and defeat them in battle.
Perform a Revive Summon using a Revival Stone.
Successfully repel an enemy invasion.
Choose to battle Aurora and Endorian.
Clear Main Mode as the Holy Gustava Empire.
Clear Main Mode in 40 seasons or less.
Completely defeat all enemy nations.
Completely defeat three enemy nations.
Capture four or more enemy bases in a single season.
Completely defeat an enemy nation.
Recruit an unaffiliated knight during an exploration quest for the first time.
Win a battle without a single wounded knight or defeated monster.
Invade an enemy base and defeat them in battle.
Summon a special rare monster.
Find a 3★ equipment or item during an exploration quest.
Obtain every other achievement.
Achieve continental unification in Challenge Mode.
Acquire a Strategy Score of 30,000 in Challenge Mode.