Here is the full list of all 35 Iragon 18+ achievements.
Choose to help Mindee in Grasspoint
Upgrade any spell for the first time
Fully upgrade your health
Fully upgrade your mana capacity
Fully upgrade any Projectile spell
Fully upgrade any Area of Effect spell
Fully upgrade any Channeling spell
Fully upgrade all Fire spells
Fully upgrade all Ice spells
Fully upgrade all Lightning spells
Defeat Arachna the Brood Mother
Defeat Warden Alathra
Defeat Darkra
Defeat Rikka of the Voiceless
Defeat the Succubus
Defeat the Harbinger
Defeat all the bosses
Finish the game on Hard difficulty
Stay in Avoch instead of going with Brianna
Finish the game with Erika as your companion
Finish the game with Jenna as your companion
Finish the game with Lexi as your companion
Finish each companion’s route
Collect 1000 mana orbs throughout the game
Collect 2000 mana orbs throughout the game
Collect 5000 gold throughout the game
Collect 10 000 gold throughout the game
Have sex with the merchant
Unlock all enemies in the Gallery
Choose to help Esme in Grasspoint
Obtain the Crystal Sword legendary weapon
Obtain the Clarity legendary weapon
Obtain the Devastator legendary weapon
Obtain the Frost Skull legendary weapon
Open every chest in the game