Here is the full list of all 12 Pirate Pop Plus achievements.
Rusty old key, opens Davy Jones' Locker
Severely worn and tattered pirate flag
"Property of Dave" embroidered on side
Slightly dented spyglass, property of Bubble Pirate
Old wooden leg, one careful owner
For the sailor who sees no evil
Worn glasses, left lens is from milk bottle
Comical inflatable hook. Small hand grip inside
Extremely aggressive (and sarcastic) parrot
Used treasure map with "X marked the spot"
Delicately fragile golden bubble, looks expensive
Cannonball made from solid gold (yeah right!)