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