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