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