Here is the full list of all 22 The Legacy: Prisoner achievements.
Completed the mini-game with the airplane at the Elder's house in the first attempt.
Completed a mini-game in less than a minute.
Completed 3 mini-games in a row without using a Skip.
Completed an HO scene in under 2 minutes.
Completed the mini-game with crystals at the tunnel gate from the Underwater City to the cliff in under 2 minutes.
The main and bonus chapters completed without skipping any mini-games.
You have found all the morphing objects.
Completed the main and bonus chapters without using any Hints in the HO scenes.
Completed the Vase collection.
Completed the Masks collection.
Completed the Golden Dishes collection.
Completed the Seashells collection.
Completed the Beetles collection.
Completed the Skulls collection.
Completed the Statuettes collection.
Completed the mini-game with symbol pairs in the temple gates without any misses.
Completed the main chapter on Hard difficulty.
Completed the main and bonus chapters without skipping any dialogue or videos.
Completed the main and bonus chapters without using any Hints.
Completed the mini-game with colorful chips in the snake dungeon in under 20 moves.
Collected all additional puzzles in the Extras Menu.
Completed all mini-game levels in the Extras Menu.