Here is the full list of all 12 Monkey Island 2 Special Edition: LeChuck's Revenge achievements.
Complete the game.
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.
Guybrush inhales some helium.
Call the LucasArts helpdesk when walking through the jungle on Dinky Island.
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.
Finish the game in under three hours.