Legacy URL note: this page used to document an outdated “Completionist” tally. Threat achievements were refreshed in v5.4x — Apex Sector now mirrors the shipped system_level_5 flag in data/achievements.js.
How it unlocks
Earn enough hostile activity in a tracked system until the HUD threat strip hits level 5. The moment the global “highest threat” statistic reaches five, you receive the Apex Sector toast automatically — no manual claim UI.
Pair it with galaxy completion
Visiting all 34 networked systems unlocks separate legendary progress toward Stargazer (full_galaxy) in the live client. Exploration achievements now appear under the Exploration section of the HUD panel.