Here is the full list of all 48 Battle Chasers: Nightwar achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Complete the Mana Rifts
Acquire 100,000 gold
Get all three chests in The Winding
Craft 50 items
Craft a legendary item
Acquire 1 of the Heroes' Ultimate Weapons
Complete the Crimson Garden
Complete Strongmont
Unlock 50% of the Lore Book
Complete 50% of the Bestiary
Catch an Epic Fish
Unlock a Hero Skin
Get a Mid level score at the Battle Arena
Complete Deadwatch
Acquire 200 Shadow Coins
Catch 50 Fish
Bring Alumon into the party
Kill 500 enemies
Craft an item with less than 10% success chance
Unlock a Level 3 Battle Burst
Complete The Dig
Kill one of the Beastmaster's Targets
Complete a dungeon on Legendary difficulty
Complete Junktown
Find Monika
Find Knolan
Complete the Path of Fangs
Complete the Iron Outpost
Recover an item from the Mystery Cube
Unlock a Beast Perk
Craft an item
Make it to the road
Kill C'drall
Complete all dungeons on Legendary difficulty
Start NG+
Finish the game on NG+
Craft 10 Rare Items
Craft 10 Epic Items
Reach level 30
Complete 100% of the Bestiary
Defeat the Pirate Captain
Complete the Fishiary
Unlock 100% of the Lore Book
Acquire all of the Heroes' Ultimate Weapons
Unlock all Hero Skins
Unlock All Battle Bursts
Get Max Score in the Battle Arena
Kill all the Beastmaster's Targets