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