Here is the full list of all 11 Tales of Monkey Island - Chapter 2: The Siege of Spinner Cay trophies - there are 5 bronze, 5 silver and 1 gold.
Gave the MerLeader every kind of bait
Get Morgan angry by repeatedly checking out the mast
Caught a Red Herring
Threatened a number of adversaries with a Hook
Heard the Secret of Donkey Island
Kicked LeFlay off the Screaming Narwhal
Get all of the Summoning Artifacts
Save the MerLeader from McGillicutty
Read every fish joke
Made LeChuck do something embarassing on the cliff
Sailed to the alleged resting place of La Esponja Grande