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