Here is the full list of all 16 Agent Walker: Secret Journey achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Solve a Minigame without using Skip.
Solve a Minigame in under a minute.
Finish a Hidden Object Scene without a mistap.
Finish a Hidden Object Puzzle without a hint.
Find three items in Hidden Object Puzzle in three seconds.
Solve three Minigames in less than ten minutes.
Find five items in Hidden Object Puzzle in five seconds.
Solve three Minigames without skipping.
Finish all Hidden Object Puzzle without using Hint.
Solve all the Minigames without using Skip.
Destroy the Spear.
Watch all Cutscenes without skipping.
Complete all the uniforms.
Find all the miniatures.
Find all the figurines.
Find and complete all collections.