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