This chapter provides you with a detailed description of how to obtain "Overkill" silver trophy in "Uncharted: The Lost Legacy". You receive this trophy for using several charges of C4 to destroy the assault vehicle resulting from a single powerful explosion.
You can also try to obtain this trophy in the sixth chapter of the game (The Gatekeeper). The enemy APC appears after you approach the central ruins shown in the above screenshot in Western Ghats, i.e. the ones neighboring the tall tower (you visited this location in the fourth chapter of the game).
From now on, try to avoid being spotted by both the APC and the mercenaries around (watch out for one standing on rooftops, they have a greater range of fire). While doing this, you can use tall grass to your aid, but you can also use buildings here, for cover.
Your first task is to obtain four C4 explosives. Keep an eye out in the ruins to find open and locked supply crates, which is where you find the charges. The majority of crates are indoors, but some are also out in the open (an example has been shown in the above screenshot).
After you have collected four charges, approach the APC-patrolled area carefully. Spend some time on learning its rouge and start throwing the charges into a spot frequented by the vehicle (shown in the screenshot). It is VERY important here that all the charges are planted in the same spot.
After you have prepared the trap, wait for the vehicle to go directly over the charges and detonate them, which will cause a powerful explosion and award you with the trophy.
Note - You can also obtain the trophy if you have been spotted, as a result of a mistake and the APC is hunting you. However, it will be more difficult then to find a good spot to plant the charges.