Here is the full list of all 12 Monkey Island 2 Special Edition: LeChuck's Revenge achievements.
Finish the game in under three hours.
Allow Guybrush to die.
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.
Complete Part One: Largo Embargo.
Complete Part Two: Four Map Pieces.
Switch to classic mode at least once.