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