Here is the full list of all 32 The Secret Order 8: Return to the Buried Kingdom achievements.
You entered the Buried Kingdom.
Finish a Minigame in 60 seconds without skipping.
Finish four Minigames, each one in 60 seconds without skipping.
Finish seven Minigames without skipping.
Finish ten Minigames without skipping.
Finish all Minigames without skipping.
Finish a Hidden Object Puzzle in 90 seconds.
Finish two Hidden Object Puzzles, each one with less than 10 mistakes.
Finish three Hidden Object Puzzles without any Hints.
Finish five Hidden Object Puzzles without any Hints.
Finish all Hidden Object Puzzles without any Hints.
Find all Collectible items.
Find all Morphing Objects.
You found the secret passage.
You calmed Droi.
You restored the Scorpion Staff.
You've opened the tomb of Nezul.
You successfully got out of the cave.
You helped Dokka collect all the gems.
You calmed the creature in Toadstool's hut.
You entered Nezul's Tower.
You removed the gem from Droi.
You freed Skaard from his box.
You revealed the dragon egg.
You found the temple.
You defeated the Skeleton Dragon.
You saved the Buried Kingdom.
You healed Skaard.
You got inside the temple.
You restored the sword.
You defeated the Dragon Rider.
You hatched the egg of the new Mother Dragon.