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