How to Acquire
- The two walls of light, one each by the beach-side and harbor-side entrances. The controls for both of these can be accessed through a hatch in the outer wall located roughly half-way between them.
- The two arc pylons, one below the beach-side entrance and one on the walkway between the fort and the lighthouse.
- The watchtower set up on the beach.
The system is considered "deactivated" when either the whale oil tank is removed or when the system is rewired. Any combination of these can be used to gain the achievement, as long as all five systems are in some way disabled.
Note that this achievement is not cumulative over multiple playthroughs, meaning all five systems must be deactivated in the same playthrough.