- Xbox One
Easy 'Serpentine' Achievement:
The Key of Serpentis can be found near the exit door in level 2-1. You will only be able to access it after unlocking Antartica and when using Aban Hawkins.
Easy 'Stone Cold' Achievement:
You can get this Achievement easily by obtaining the key of Serpentis to unlock the final stage and Boss and then Killing that Boss.
Unlock Counseil's Duty Free Shop:
Counseil's Duty Free Shop will become unlocked when you have collected 12 golden skulls.
Antarctica Temple:
When you complete ALL the Akumpa Ruins levels Antartica Temple will become unlocked, to unlock this feature for ALL the characters you must view the True Ending.
Unlock Tower Of Nanar Co-Op Mode:
This feature will become unlocked when you have collected 6 golden skulls.
Unlock Bonus Characters:
The following characters become unlocked when you complete the corresponding task.
Commander Video:
Collect 8 golden skulls.
Sugimoto:
Collect 16 golden skulls.
Juni:
Collect 18 golden skulls.
President Thompson:
Collect 20 golden skulls.
Zombie:
Collect 23 golden skulls.
El Testigo:
Collect 26 golden skulls.
Curly Brace:
Collect 30 golden skulls.
Jim Hawkins:
View the 'True' ending.
Tina Hawkins:
Successfully complete Ukampa Ruins.