For Hi Ben, load up Regret with Sputnik activated. Just before you get on the first Gondola, look to the right to see a small building you can grenade-jump to. Jump over and head around the right-hand side of the lower level to find a dark room. Zoom in on the ceiling behind the pillar on the left to unlock the achievement, and if it doesn't unlock switch to classic mode.
![](https://s2.save4k.ru/pic/1RCqCQnNtfY/mqdefault.jpg)