Here is the full list of all 16 Skyland: Heart of the Mountain achievements.
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.
Finish a Hidden Object Puzzle with less than 3 mistakes.
Save the seer.
Finish 3 Hidden Object Puzzles without using hint.
Finish a Hidden Object Puzzle in less than 20 seconds.
Complete 3 Minigames without a Skip.
Finish a Puzzle in less than 30 seconds.
Find the first Collectible.
Win the fight against the first drone.
Finish a Fight Puzzle without using Skip.