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.
Call the LucasArts helpdesk when walking through the jungle on Dinky Island.
Complete Part Three: LeChuck's Fortress.
Complete Part Two: Four Map Pieces.
Complete Part One: Largo Embargo.
Finish the game in under three hours.
Switch to classic mode at least once.
Allow Guybrush to die.
Guybrush inhales some helium.