Fast route
Do this in order
- Step 1
Progress the main story until the Catacombs door objective appears.
- Step 2
Complete the key, spell or quest requirements shown by the tracked objective.
- Step 3
Interact with the sealed door and enter the Catacombs after it opens.
Prepare before you start
Do not begin until the related system or story area is unlocked. Keep the achievement condition visible while you play, and save before seasonal or one-night attempts.