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