Successfully complete the listed task to unlock the corresponding achievement.

Achievement	How to unlock
Ace Pilot	Collect 25 crowns.
Boss Hunter	Collect 10 skulls.
Champion	Collect 30 trophies.
Golden Crown	Collect 5 crowns in any Score Mode mission.
Hard Mission Complete	Collect 3 trophies in any Hard Mission.
Metal Sparrow	Collect 50% upgrades for your helicopter.
Nemesis	Collect 3 skulls in any Survival mission.
Score Mode	Unlock Score Mode for any mission.