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