Here is the full list of all 17 Colours of Magic: Aqua Teeter achievements.
Learn everything from the Black mage
Complete 50 levels with 3 stars or more
Learn everything from the Brown mage
Learn everything from the Red mage
Complete 25 levels with 2 stars or more
Learn everything from the Green mage
Skip single level with gems
Learn how to mix Violet elixir
Lose an elixir over the edge of the field
Lose an elixir in the Black Hole
Learn everything from the Blue mage
Complete 10 levels with 1 star or more
Learn how to mix Blue elixir
Learn how to mix Yellow elixir
Learn how to mix Green elixir
Learn how to mix Red elixir
Deliver Neutral elixir