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 in less than 180 minutes for your total turns. (Normal or Hard Difficulty)
Survive all battles on Normal.
With 6 Rank 10 units, win a Hard difficulty sparring battle in the Training Tent.
Complete the game without letting anyone in your caravan die to hunger.
Fight 32 battles in a single playthrough.
Complete the game on Normal difficulty.
Meet King Meinolf with Alette.
Reach Arberrang in 100 days or less.
Bring 400 clansmen safely into Arberrang.
Maintain an alliance with Rugga.
Kill a Sundr.
Reach Oldford with at least 20 Varl following Bolverk.
Acquire 3 rank 10 items.
Complete Holfi's Training.
Complete the game on Hard difficulty level without losing a single battle.
Complete the game without ever getting low morale.
Complete the game on Hard difficulty.
Meet King Meinolf with Rook.
Visit the godstone Lauga.
Witness Eyeless possess 10 fallen units.
Break 30 barricades in a single playthrough.
Visit the godstone Bygglaerer.
Kill 5 in one turn with Cull the Weak.
Visit the godstone Geirraðr.
Complete Sven's Training.
Visit the godstone Vez'nan.
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 War Bear.
Defeat 3 enemies with a Male Horseborn Teulu.
Visit the godstone Baldringr.
Defeat 3 enemies with a Slaughterer.
Visit the godstone Irynx.
Defeat 3 enemies with an Axe Thrower.
Defeat 3 enemies with a Wanderer.
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.
Bolverk always acts as the Ravens expect.
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 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