You can quickly press X (buy) and then Square (sell) repeatedly until the trophy pops. Go to a merchant, buy one knife and then sell it. There is a very quick method available for getting this trophy. All 10 must be disarmed in a single playthrough.

It’s also important to note that you cannot find one trap, disarm it and reload the checkpoint. When you find one, walk up to it and press Square to disarm it. Just pay attention and be on the lookout for them.

Do this to 40 lights and the trophy is yours. Simply get near a light bulb and press Square to turn them off. You will come across lighted areas and have the opportunity to turn off light bulbs to help you stay hidden. When sneaking around in Metro, darkness will greatly help you to stay undetected. – Turn off 40 lights without breaking them. You will come across numerous light bulbs throughout the game, so simply shoot out 50 of them to earn this trophy! Toss an incendiary grenade at them and the trophy is yours! When sneaking through the tunnels you will frequently come across a group of human enemies standing still talking. The easiest way to get this trophy is to throw an incendiary grenade at a group of enemies.

The best place to earn this is on the level Revolution. It also does not count if you kill an enemy who is investigating a body or if they think they see you. You have to stealth kill 15 enemies in a row. The description is a little misleading for this trophy. To stealth kill an enemy, you must be crouched and sneak up on an enemy undetected and press R3. This trophy will come naturally over time by just playing the game.

Metro last light chapter