Metro Last Light

This gave me a lot of trouble. After going through the level three times, carefully burning, and keep burning all the spiders in my path, I decided to try something different on my 4th run.

Instead of burning as you go, WAIT until you reach the end of the level. Use the shotgun, out run the spiders and collect as many gas units as you can (don't forget to look up, some are up high on shelves). I had 600 units total at the last checkpoint. Once you turn on the power and turn the switch to open the door at the top the of missile is where you get the checkpoint. Hit the lever on the blue-lit console and STAY IN THAT ROOM. Find yourself a nice corner and start burning. If you go out to the missile, the burning spiders will drop down to the level below and won't count. As far as I can tell, the only spiders that count are the one's that explode into flames. The spiders ARE NOT unending, they will stop after a while, but it should be enough to get the achievement. If you don't get it, simply reload the checkpoint. Now you don't have to replay the level.


TL;DR version: Wait until the last checkpoint before using any gas. Hit the switch for the elevator, stay in the room, turn off the headlamp and burn away. If you don't get the achievement, reload checkpoint.

Easy way to do this.

Only female spiders count. These are the ones without the tail; thy have round bodies no tail and are harder to burn.

Use shotgun for males, flamethrower for females.

There is a section while climbing silo, just after you flick a switch to lower gates but have to burn webs to lower gates, you can kill 4-5 females easy here. Climb ladder to next section where females don't engage you but are on the walls. They only require a short burst from flamethrower to die unlike when they agro you.

This is before the room you can enter where you jump over a fallen cabinet.

This one is trickier than it sounds. You have to burn them with the flame thrower - toast them until they are black as a marshmallow over a campfire - or else you may accidentally finish them off with your headlight. I burned a ton of them without the cheevo popping, then I started to very thoroughly roasting them and it finally popped.

Also, if you don't get it, once you reach the end there will be an unending swarm of them. They will continuously swarm until you step into the elevator. This is your chance to smoke the remainder if you missed any.