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