Saw
46 Achievements
1,000
8-10h
Wait For The Boom
First kill with an Explosive Mine.
10
How to unlock the Wait For The Boom achievement in Saw - Definitive Guide
After you find the gas schematics, you get the explosive schematics in a room with "eye C U" on the wall. Its definitely missable, so look around. This is before you jump down a hole that you cant get back up, and before Pig-Face cutscene. You will need to collect 1 fuse and 2 shotgun shells.
To the right of the nail bat in the glass, is a door to pick to get access to a work bench. After the fight with Pig-Face, you will encounter a room with several minions. Smack one around a few times to get their health down, then set the trap. Right bumper cycles thru them, then LT + RT will drop it.
You'll find the schematic for the Explosive Mine during the game. Once you've created an Explosive Mine on one of Jigsaw's workbenches, find a minion, punch him a few times to weaken him, and then select the Explosive Mine with R1, hold L2 to enter combat mode and hit R2 to drop the mine. Let the minion walk into the mine, and if he dies, you'll get the trophy, even if you die too.
Schematic Location: Oswald, 4-3. This is on a table next to a camera in the room just after the big shirtless dude with a nail bat attacks you.
Secondary Schematic Location: Tapp, 7-2. Inside a locked room in the section to the right just after walking over a plank into a green-lit hallway.
Oswald, 4-3: Shortly after finding the schematic, you will come across two Molotov enemies. Kill them and to the left is a small alcove with three doors. Pick the door on the left to reach a work table. You can also find a table with the scissors in 4-9 if you don't have a nail at this point.
To kill someone with a mine, I'd suggest hitting them with a weapon or fists until they are low on health, then run away and use RB to cycle through your mines to find the one you want and press LT+RT to place the mine. Stand a bit behind the mine and the low-health enemy will chase you, stepping on it and dying.