Here is the full list of all 30 Skully trophies - there are 11 bronze, 13 silver, 5 gold and 1 platinum.
Sacrifice yourself to save the world
Defeat Terry & Break the Jar
Find 100% of the collectibles in 12 chapters
Find the super secret Terry Figure
Say Hi to Mom
Stare straight at the Camera
Have a falling-out with Terry
Find 100% of the collectibles in 8 chapters
Summon the Vault Form
Capture Wanda
Find 100% of the collectibles in 4 chapters
Summon the Swift Form
Defeat 100 Water Punks
Complete any chapter without dying
Find 100% of the collectibles in any chapter
Summon the Strong Form
Meet Terry
Obtain all other Trophies
Defeat 50 Lava Punks
Complete the Tidal Wave Chase without dying
Complete the Volcano Eruption without dying
Complete the Lava Tube Chase without dying
Find the super secret Wanda Figure
Find the super secret Fiona Figure
Find the super secret Brent Figure
Complete 5 different chapters without dying
Find 100% of the collectibles in 15 chapters
Throw Skully 60m
Complete 10 different chapters without dying
Find 100% of the collectibles in all chapters