Here is the full list of all 52 Immortal Empire achievements.
Find your first mythical item
Complete a level without killing anything
Complete a level using only magic
Complete a level using only physical attacks
Get the lowest possible romance score
Get the highest possible romance score
Reach the maximum number of profile attributes
Reach the maximum possible perception attribute
Reach the maximum possible wisdom attribute
Reach the maximum possible charisma attribute
Reach the maximum possible will attribute
Reach 500,000 gold
Reach 5,000 radiance
Buy an item for at least 100,000 gold
Equip 1 immortal full with items
Reach 5,000 kills without dying
Reach the maximum immortal level
Survive a turn with only 1 hit point remaining
Equip one immortal with all enchanted gear
Solve the mystery in Ashen Plateau
Complete every level challenge
Complete a level without taking damage
Reveal an entire map
Kill 5 enemies with a single spell
Deal 500 damage with a single attack
Have 5 buffs active on an immortal at once
Complete a level without startling any enemy
Unlock first new area
Purchase your first store item
Purchase your first radiance item
Craft your first phrase or verse out of glyphs
Play your first versus match
Defeat your first gauntlet level
Find your first divine item
Acquire your first charm
Acquire your first rune
Win 25 ladder versus matches
Control 5 immortals
Find a black crystal
Complete a level with a co-op partner
Kill Buono
Kill Raek
Kill Junji
Kill Berelorn
Kill Vuldreth
Kill Vuldreth on hard difficulty
Kill Vuldreth on brutal difficulty
Complete the gauntlet on any difficulty
Complete the gauntlet on immortal difficulty
Reach 100% achievements and challenges
Enchant your first item
Kill Vuldreth on insane difficulty