METAL GEAR SOLID V GROUND ZEROES
15 Achievements
1,000
15-20h
Infiltration
Cleared the "Classified Intel Acquisition" Side Op while riding in the back of a truck
50
How to unlock the Infiltration achievement in METAL GEAR SOLID V GROUND ZEROES - Definitive Guide
Start the Classified Intel Acquisition mission. You will be on the back of a truck. You'll have to stay on there until the truck stops in the base. You'll know when you're there because the driver will get out.
Once the driver walked away jump off the the truck. Right in front of you should be some big shelves. You can crawl under one of them. When you get up there should be a ladder you can climb up just in front and to your left.
Get up there and follow the catwalk there. Climb up another ladder to get to the guard tower. In there will be a security camera. Destroy it with a regular gun. Then pick up the tape on the desk in there.
Get out of the tower again. Get down the first ladder. Right under you will be the truck you arrived in. Jump off the catwalk and onto the truck again. Lie down and wait until the driver gets back in to complete the mission!
Just a little tip if the achievements didn't unlock when you tried this solution....
I completed this mission four different times exactly how you said to do it with an S-Rank but the achievements weren't unlocking. I ended up rebooting my Xbox by holding down the power button on the console for ten seconds. After the reboot, I replayed the mission and three achievements unlocked!
At the beginning, stay in the bed of the truck for about 2 minutes until the truck is parked and the driver leaves. Now, sneak out the back, make your way behind the building, through the alley, and then up the ladder to the guard tower nearby. Watch out for guards that may spot you. Before entering the guard tower, make sure you shoot the camera inside the room on the ceiling, take the cassette tape off the desk, then drop back down into the bed of the truck. Now wait for the driver to return, and he'll drive you out of the mission taking about 3 minutes, gaining the achievement and an S Rank.
I leave the truck and walk into the Base. In the Basis i go into the Boilerroom and collect the Cassette Tape (Classified Intel Data). Its the second Tape in this Mission and you need this for the Information Achievement.
After collecting the Tape, i go forward to the Guard Tower and collect "missions" Tape. After i jump down and go to a other Truck which leave the Base earlier as the other one.
My finish Time was 05:31:01 and i earn 58035 Points with an S-Rank
Stay in the vehicle the entire trip until it comes to a stop, wait for the driver to leave, then sneak behind the building on the left side. You'll come to a ladder, climb up and head to the tower in front of you. There is a security camera right inside the doorway, so peek around and take it out; then grab the cassette tape on the desk. Sprint back to the truck as a soldier will make their way towards the tower to check the camera, but you should be long gone before you are spotted.
Take the same route back to the truck and lay down inside. You'll have to wait a few minutes (depending on how quick you got the tape and came back), but the driver will return and drive out of the area. Just be sure to stay prone so you aren't spotted while leaving.
This mission starts you in the bed of the truck straight away. Don’t leap off just yet, stay prone. The truck will enter the Admin Building of Camp Omega after a minute or so. There’s a large gate to bypass and an alarm blares whenever the gate opens and closes. After passing the gate, the truck will stop and back up to the left. Do not shoot or engage in CQC with the truck driver once he steps out of the vehicle, wait for him to leave your line of sight. Get out of the truck and make your way left to where the blue “off limits” sign is.
Crawl and move on. You might come across a guard that’s walking around, dispose of him with the Wu Silent Pistol. Look out for a ladder on your left that leads to the walkway above. Once you shimmy up the ladder, head on over to the watch tower...but wait! See the security camera inside the tower? Switch to the AM MRS-4 Rifle and shoot it.
Continue and grab the cassette tape on the desk inside the tower, then head back down to the truck and wait in the bed for a few minutes. Stay prone. Mission accomplished. The driver will eventually come back and he’ll help you make your escape. What a gentleman!
As soon as the mission starts, remain stationed inside the bed of the truck. The ride will last about two minutes or so, until the vehicle enters the admin building, comes to a stop and the driver leaves. As soon as he is out of view, hop out of the truck, and move along the backside of the building on your left and through the alley. Once you reach the end, climb the ladder on your left once any guards have left the area and at the top, make your way down the catwalk and up the next ladder. Slowly inch around the doorway and shoot the camera inside this guard tower with your Assault Rifle.
With the security camera taken out, you are now free to grab the cassette tape on the table and backtrack all the way to the truck. Hop in the bed of the truck and wait a few more minutes until the truck driver returns. After a short ride, the truck will finally leave Camp Omega and the mission will end, in turn unlocking your achievement and granting you an S-rank as well!
Below, you can view a video guide which details the method explained in text above.
I will also add that the truck does not always leave the base immediately, and you may have to wait either inside the base, outside the main gate, or at the checkpoint.