Checklist
[] 1. Kill 100 Grunts first, then drive a Warthog back to the Base’s Main Gate.
[] 2. Kill 20 Jackals first, then find the Skull located south of Alpha Base.
[] 3. Kill 45 Hunters first, then check the area where Forge and Anders were pinned down to collect this Skull.
[] 4. Kill 50 Elites first, then check out the Bronze Statue east with a Hornet.
[] 5. Destroy 5 Wraiths first, then check the eastern roads from the 2nd Base to find it in a desolate area.
[] 6. Kill 50 Banshees first, then check behind your base around the hangar to secure this Skull.
[] 7. Kill 10 Locust first, then search the northwest nearby one of the Power Nodes.
[] 8. Kill 750 Infection Forms first, then find this Skull northeast of the area where the 2nd Elephant was.
[] 9. Kill 20 Flood Stalks first, then collect this Skull from the northeast area from your base.
[] 10. Kill 350 Swarms first, then traverse the map with a Hornet to locate the Skull northeast of your base, near several Flood Eggs.
[] 11. Kill 100 Sentinels first, then check the front of the ship with a Hornet.
[] 12. Kill 12 Spirit Transports first, then check between the two lower air locks with a Hornet.
[] 13. Kill 10 Bomber Forms first, then destroy The Flood base located nearby the first transporter(s) and find the Skull here.
[] 14. Kill 20 Vampires first, then check north from the 2nd (former) Covenant Base to find it nearby some resource crates.
[] 15. Kill 3 Scarabs first, then check the northern area of the map. Secure this Skull that is found amongst The Flood.
