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