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