Diver

Diver is an achievement/trophy in Metro Last Light which is awarded to the player for falling in the swamp 10 times.

Guide
Falling in the water once near a shore is not lethal, but falling again within 15 seconds of getting back up will trigger a scripted death where Artyom is attacked by a shrimp underwater, the same can happen if the player goes too far and fall to the deep end of the swamp. It is an easy achievement/trophy to achieve as you can fall in the swamp, die and restart the level as many times as you want, and the count will not reset. Using the wristwatch, you can time falling in the water with just the right frequency as to both avoid dying and waiting too long. Falling in the water may also spawn a shrimp nearby, but its presence makes no difference towards the activation of the scripted underwater death. The best levels for attempting this achievement are Sundown and Nightfall, but any level with a swamp adds to the count.