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