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