1 0 0During the level Cuckoo Clock: Gates of Time after you've done the initial puzzles you will reach a big town you can run around in. For this particular achievement you'll need to look for a sign that says Helltower. Just go forward and stick to the left and you should reach it. When you get there it is activated by pounding the buttons there. A big tower will emerge and you'll have to reach the top. Once one of you reach it the achievement will pop.Alternatively you can teleport to the town after you've beaten the game by choosing either the Bomb Run or Horse Derby minigames provided you found either of them during the first playthrough