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