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