Here is the full list of all 30 Mages of Mystralia achievements.
Create a spell that uses all four elements
Stay on your Creo spells for 2 minutes without touching the ground
Defeat 10 enemies with your clones
Defeat the Councillor
Complete the Ghost Buster quests
Find the Mystralian Elixir
Find every wand
Reach 100% completion
Fully upgrade your health
Fully upgrade your mana
Use a Scarab during a boss battle
Complete the Dark Tower in under 10 minutes without dying
Collect a total of 2500 green soulbeads in one adventure
Find all the runes
Defeat 5 goblins with the same spell
Earn the Igni mastery
Find 60 chests
Make a Boar-Rider defeat an ally 5 times in one adventure
Use a Teleportation Anchor 5 times in one adventure
Earn the Gaea mastery
Earn the Aqua mastery
Defeat an enemy with an Actus spell with a Left or Right rune from far away
Earn the Aura mastery
Defeat 500 enemies in one adventure
Defeat the Ghost Queen
Destroy a total of 1000 objects in one adventure
Have a conversation with 30 NPCs in one adventure
Defeat the Ice Lizard
Defeat the Giant Wood Wretch
Defeat the Goblin Champion