Here is the full list of all 12 Monkey Island 2 Special Edition: LeChuck's Revenge achievements.
Finish the game in under three hours.
Beat the game without using one hint.
Beat the game using fewer than 10 hints.
Complete the game by using object highlighting five times or less.
Call the LucasArts helpdesk when walking through the jungle on Dinky Island.
Complete the game.
Guybrush inhales some helium.
Complete Part Three: LeChuck's Fortress.
Allow Guybrush to die.
Complete Part Two: Four Map Pieces.
Complete Part One: Largo Embargo.
Switch to classic mode at least once.