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