Here is the full list of all 55 The Banner Saga 2 achievements.
Survive without using the Horn for willpower. (Normal or Hard Difficulty)
Survive Hard Mode without a single reload
Survive all battles on Hard.
Survive with only female Heroes. (Normal or Hard Difficulty)
Survive without a single Hero dying. (Normal or Hard Difficulty)
Survive using only parties of 4 varl in every battle. (Normal or Hard Difficulty)
Survive without Recruiting Heroes. (Normal or Hard Difficulty)
Survive with only human Heroes. (Normal or Hard Difficulty)
Survive with fewer than 20 Heroes dying. (Normal or Hard Difficulty)
Survive in less than 180 minutes for your total turns. (Normal or Hard Difficulty)
Survive all battles on Normal.
Survive all battles on Easy.
Complete the game without letting anyone in your caravan die to hunger.
Complete the game without ever getting low morale.
Maintain an alliance with Rugga.
Witness Eyeless possess 10 fallen units.
Defeat 3 enemies with War Bear.
With 6 Rank 10 units, win a Hard difficulty sparring battle in the Training Tent.
Import Save Game from Banner Saga 1.
Complete the game on Normal difficulty.
Meet King Meinolf with Alette.
Defeat 3 enemies with Zefr.
Defeat 3 enemies with a Slaughterer.
Defeat 3 enemies with a Male Horseborn Teulu.
Defeat 3 enemies with a Wanderer.
Build an army of over 600 trained fighters.
Complete the game on Hard difficulty.
Complete the game on Hard difficulty level without losing a single battle.
Fight 32 battles in a single playthrough.
Meet King Meinolf with Rook.
Bring 400 clansmen safely into Arberrang.
Reach Arberrang in 100 days or less.
Visit the godstone Lauga.
Defeat 3 enemies with a Female Horseborn Cantref.
Kill a Sundr.
Bolverk always acts as the Ravens expect.
Reach Oldford with at least 20 Varl following Bolverk.
Kill 5 in one turn with Cull the Weak.
Kill 5 enemies while stealthed.
Complete Holfi's Training.
Visit the godstone Bygglaerer.
Acquire 3 rank 10 items.
Visit the godstone Geirraðr.
Complete Sven's Training.
Defeat 3 enemies with a Tracker.
Visit the godstone Vez'nan.
Defeat 3 enemies with a Shieldmaiden.
Defeat 3 enemies with a Poet.
Visit the godstone Baldringr.
Defeat 3 enemies with an Axe Thrower.
Break 30 barricades in a single playthrough.
Visit the godstone Irynx.
Defeat 3 enemies with a Berserk.
Visit the godstone Aselei.
Prevail with Rook against overwhelming numbers.