Here is the full list of all 28 Devils & Demons achievements.
Defeat 100 undead
Complete „A Place of no Hope“
Heal for a total of 10,000 HP with spells
Survive the attack on the Order Fortress
Unlock 8 hero characters
Complete “At cold Death's door”.
Complete 10 World Events
Kill 150 cultists
Heal civilians for 10,000 Hp
Reach level 30 with 8 characters
Defeat 10 dragons
Use 1.000 potions
Kill 50 demons
Inflict at least 4 different status effects on a single enemy.
Find 1000 hidden objects.
Complete 50 events or encounters with snow.
Save 100 villagers in Worldevents
Complete "The Depths of Karlahan"
Complete "When Playing with Fire"
Defeat 75 wolves
Revive a single character 5 times in a battle
Win 100 random encounters
Stun 100 opponents
Kill 6 enemies with a single attack
Fight with the same hero in 100 skirmishes.
Win 50 Random Encounters
Loot 100,000 Gold
Reach level 30 with a single character