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 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 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.
With 6 Rank 10 units, win a Hard difficulty sparring battle in the Training Tent.
Complete the game on Hard difficulty level without losing a single battle.
Prevail with Rook against overwhelming numbers.
Complete the game without ever getting low morale.
Complete the game on Normal difficulty.
Meet King Meinolf with Alette.
Fight 32 battles in a single playthrough.
Kill a Sundr.
Witness Eyeless possess 10 fallen units.
Acquire 3 rank 10 items.
Complete Holfi's Training.
Complete the game without letting anyone in your caravan die to hunger.
Complete the game on Hard difficulty.
Meet King Meinolf with Rook.
Reach Arberrang in 100 days or less.
Bring 400 clansmen safely into Arberrang.
Visit the godstone Lauga.
Maintain an alliance with Rugga.
Bolverk always acts as the Ravens expect.
Reach Oldford with at least 20 Varl following Bolverk.
Break 30 barricades in a single playthrough.
Defeat 3 enemies with a Slaughterer.
Visit the godstone Bygglaerer.
Kill 5 in one turn with Cull the Weak.
Defeat 3 enemies with Zefr.
Kill 5 enemies while stealthed.
Visit the godstone Geirraðr.
Defeat 3 enemies with War Bear.
Complete Sven's Training.
Visit the godstone Vez'nan.
Defeat 3 enemies with a Tracker.
Build an army of over 600 trained fighters.
Defeat 3 enemies with an Axe Thrower.
Defeat 3 enemies with a Female Horseborn Cantref.
Defeat 3 enemies with a Male Horseborn Teulu.
Visit the godstone Baldringr.
Visit the godstone Irynx.
Defeat 3 enemies with a Berserk.
Defeat 3 enemies with a Wanderer.
Defeat 3 enemies with a Shieldmaiden.
Defeat 3 enemies with a Poet.
Visit the godstone Aselei.
Import Save Game from Banner Saga 1.