The Adventures of Tintin The Secret of the Unicorn - The Game

Since the other two solutions were kinda confusing. What I did was go to level 7 in story mode called "The Salons" and it was a little bit in the level. You'll come into an area with 4 guys, grab the green bottle, open the 1st door and aim at the chandelier and it'll fall onto two guys. Just die and repeat. Easy peasy.

The description of the achievement is not worded very well. It does NOT mean you have to hit five enemies with one single chandelier. It's, instead, a cumulative achievement, where you knock out five enemies with chandeliers over time.

In a scene with chandelier(s), there are usually throwable objects lying around. Approach one of these objects, and press RT to pick it up. Position yourself appropriately and aim (with LS) at a chandelier until the end of the dashed line changes into an explosion icon. Hit either 'A' or 'X' to throw. The resulting projectile should hit the chandelier, which in turn falls onto the hapless enemies below.

The best place to get this I've found, is the very first platform level (the chateau), where you go and look for the second scroll.

Enjoy.

You should be able to get this just through playing the chateau level - keep an eye out for the chandelier's dangling evey so often, and hit them with the beach ball when someone is underneath them!