HELP! Mark Of The Ninja Remastered GOG version Achievement glitched (Escape)

[AlecFear]

"Escape" achievement is glitched, the description is Escape from the Stronghold. I almost completed all achievements but that one (for completing the Set to Fly level) is not unlocked after completing the level like 3 times already.

Is the only achievement I need to complete the game 100%

[noumansaeed]

Check the official page. I remember seeing all the details there.