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