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