Brigandine Abyss Achievements: All 39 Listed

Wording below is taken from the Steam achievement list for app 3211430 and grouped by what the requirement actually asks for. Console trophy lists mirror the same set. Hidden entries are shown with their name only — this site does not guess at unlisted requirements.

Story Mode (6)

Achievement How it unlocks
Humans and Dragons Complete Gran Dragnica's Story Mode
Inheritor of the Samura Spirit Complete the Samura clan's Story Mode
The Saintess and the Forbidden Beast Complete Pandemyuon's Story Mode
Alysbelle of the Fae Village Complete Purifanoe's Story Mode
The Scarlet Dawn Complete the Scarlet Will's Story Mode
Protector of the Continent Complete Mysteine's Story Mode

Mission Mode (4)

Achievement How it unlocks
This is just the lead-in!♪ Complete Mission Mode with 3 different factions
Around a third done, perhaps? Complete Mission Mode with 8 different factions
Nine left! No room for letting up!! Complete Mission Mode with 15 different factions
You have fought well, warriors of the present age. Complete Mission Mode with all factions

Gallery (5)

Achievement How it unlocks
Dominion over all... I could get used to this! Complete the gallery's Mercenary/Monster List
Leave analyzing the field to me! Complete the gallery's Battle List
Everyone's feelings... There are so many! Complete the gallery's Atlas of Meltitea
You have witnessed all of history's course... Complete the gallery's Faction List
A veritable banquet of lives to choose from... Hehe♪ Complete the gallery's Character List

Combat & Units (13)

Achievement How it unlocks
This is our first victory... Win your first battle
We... W-W-W-We won?! Defeat your first enemy leader unit
Everyone made it out safe...! Achieve a victory without any of your units being defeated
We must all fight as one! Rally a unit for the first time
Our bond's stronger than anyone's! Defeat an enemy leader unit who has a monster rallied
Remember to love beasts as family... Bind fates with a monster unit for the first time
Leave the investigating to me! Perform a quest for the first time
Come on! Join us! Bind fates with a leader unit for the first time
Awaken, flames of darkness!! Perform your first class change
New faces are always welcome, you know! Recruit a leader unit via a quest for the first time
I have a thing or two to learn from you! Perform 100 quests
Pinnacle...of skill. Raise a skill's level to the maximum
This! This is the ultimate power!! Raise a unit's level to the maximum

Kingdom Management (7)

Achievement How it unlocks
Nothing gets past my gadgets! Defend against at least 3 invasions from other factions in one playthrough
We've come so far... Control 10 or more bases in one playthrough
Coffers overflowing with coin... Impressive. Accumulate 1,000,000 mel
Ya seein' this? I've built the city of my dreams! Raise a base's level to the maximum
Found something real nice! Obtain your first ★★★ rarity equipment
I alone am the true Imperator!! Control every base
Whatever weapons you need, I'll transport them! Obtain every weapon

Hidden (3)

Achievement How it unlocks
This's our win! Hidden Hidden achievement — requirement not shown on the Steam achievement list.
Money is no object! Hidden Hidden achievement — requirement not shown on the Steam achievement list.
I can take you all out at once. Go me. Hidden Hidden achievement — requirement not shown on the Steam achievement list.

Completion (1)

Achievement How it unlocks
Conqueror of the Abyss Unlock all achievements

Planning a full clear

The four Mission Mode achievements stack in the same run of playthroughs — 3, 8, 15 and then all nations — so every Mission Mode campaign you finish counts toward the next tier. The six Story Mode achievements are separate campaigns, one per nation, and each is named after that nation's plot: they line up one-to-one with the Story Mode column on the factions page. The gallery set is collection work: the Character List, Faction List, Mercenary/Monster List, Battle List and the Atlas of Meltitea.

Achievement list checked:

See also: Mission Mode objectives for what a nation's win condition can ask of you, and the beginner guide for the early unlocks.