Here is the full list of all 66 Demon Strikes Back achievements.
The ruling of deep water overlord is forever terminated
Defeat Kung Fu master at the Colosseum
Triumph over the soul reaper at swamp of despair
The necromancer had finally faced off her own death at shadow crypt
Defeat Guardian of the oaks at the mystic valley
Harvest the heart of forest
Collect all armours
Learn all skills
Meet all kind of enemies
Collect all relics at least once
Collect all items at least once
Collect all archive items
Deal 50000 damage in a single game
Deal 100000 damage in a single game
Deal 200000 damage in a single game
Regenerate 1000 health in a single game
Regenerate 1500 health in a single game
Regenerate 2000 health in a single game
Kill 200 enemies in a single game
Kill 300 enemies in a single game
Kill 400 enemies in a single game
Consume 500 mana in a single game
Consume 1000 mana in a single game
Consume 2000 mana in a single game
Finish the game within 60 minutes
Finish the game within 40 minutes
Finish the game within 20 minutes
Slay 1000 enemies in your lifetime
Slay 5000 enemies in your lifetime
Slay 10000 enemies in your lifetime
Die for the first time
Die 10 times
Die 100 times
Earn 10000 gold in your lifetime
Earn 50000 gold in your lifetime
Earn 100000 gold in your lifetime
Harvest 1000 soul in your lifetime
Harvest 5000 soul in your lifetime
Harvest 10000 soul in your lifetime
Collect 1 essence stone in your lifetime
Collect 100 essence stone in your lifetime
Collect 500 essence stone in your lifetime
Spend 500 gold using the fortune wheel in your lifetime
Spend 2500 gold using the fortune wheel in your lifetime
Spend 5000 gold using the fortune wheel in your lifetime
Finish any level within 7 minutes
Finish any level within 6 minutes
Finish any level within 5 minutes
Finish any level without taking any damage
Clear a room without dealing any damage
Enter the portal with less than 5% of your health left
Kill 8 enemies at the same time
Receive healing from a paladin
Gear yourself with a set of legendary equipments
Unleash you ultimate twice swiftly
Fall to your own death
Complete the game at least once
Complete the game without consuming any gold at least once
Get a legendary equipment
Get a legendary equipment through gamble
Upgrade your skill to legendary level
Unlock all demon talents
Finish all training at the training ground
Finish all upgrades at the blacksmith
Finish all upgrades at the hostel
Acquire all talents