Here is the full list of all 20 Lost Lands: The Four Horsemen achievements.
Completed a mini-game in less than a minute.
Completed 3 mini-games in a row without using a Skip.
Completed the main and bonus chapters without skipping the mini-games.
Collected all Ghost objects.
Found 3 objects within 3 seconds in HO scene.
Completed the main and bonus chapters without using any Hints in the HO scenes.
Completed an HO scene with no unnecessary touches.
Assembled the Magic machine.
Completed the plates-and-symbols mini-game with no unnecessary touches.
Completed the main chapter on Hard difficulty.
Completed the main and bonus chapters without skipping any dialogue or videos.
More than 5 minutes were spent in mini-game to complete it.
Assembled the mechanical device with gears.
Completed the mini-game with water level.
Completed the animals mini-game with less than 70 handle turns.
Saved yourself from the dark horseman.
Collected all the pages from the book of Forgotten Lands.
Completed the main and bonus chapters without using any Hints.
Completed an HO scene in under 2 minutes.
Restored the dwarf mosaic in less than 1 minute.