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