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