No missable achievements (plus 16 unknown)
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Escaped Howell's Ship
Sent a shipmate on a trip to remember
Invented the trampoline
Joined a pirate crew
Infiltrated pirate stockade
Sailed to Shipwreck Island
Found Silvereye's treasure
Rode a sea turtle
Defeated DeSilver
Escape in a hot air balloon
3x coconut knock-out
Completed game without hints
Found all pieces of eight
Found all pirate flags
Found all crackers
Earned maximum score