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