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