1. 1 Attack the remaining ships.
2. 2 Defeat 10 hostiles of Level 42 or higher.
3. 3 Defeat final ship.
4. 4 Bring Arlen back to his station.

Dashed boxes are real missions from stfc.space's own data that aren't in the stfc.club database yet (usually base-building objectives like "Upgrade Shipyard to Level 20").