Here is the full list of all 16 Skyland: Heart of the Mountain achievements.
Finish Bal's Diary Puzzle without using Skip.
Extinguish all the fires.
Find half of the Collectibles.
Finish 3 Hidden Object Puzzles without using hint.
Finish a Puzzle in less than 30 seconds.
Save the seer.
Finish a Hidden Object Puzzle with less than 3 mistakes.
Complete 3 Minigames without a Skip.
Find the first Collectible.
Win the fight against the first drone.
Finish a Fight Puzzle without using Skip.
Seek those who climb high.
Finish a Hidden Object Puzzle in less than 20 seconds.
Finish the final Fight Puzzle without using Skip.
Finish all the Hidden Object Puzzles without using Hint.
Find all the Collectibles.