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