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