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