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