Shadow of the Tomb Raider

In the Main Menu, select the "Challenge Tombs" tab and then choose "The Sixth Seal." In the following menu, you can then sift through three different modes: Exploration, Score Attack, and Time Attack.

In order to unlock this achievement, you will need to earn any medal in Time Attack. This mode is all about completing the Challenge Tomb (i.e. reaching the stele) as quickly as possible. The medal requirements are as follows:

• Gold: 5 minutes
• Silver: 8 minutes
• Bronze: 10 minutes

The Sixth Seal is a rather straightforward Challenge Tomb given there is only one main puzzle that takes less than five minutes to set up and complete. That being said, if you feel the need to fall back on a video walkthrough to get it done, please refer to THIS VIDEO, courtesy of Everlong Raider.