Crisis Core Final Fantasy VII: Reunion has plenty of missable Trophies/Achievements, especially throughout the main story. The Master Infiltrator is one such Trophy/Achievement in Chapter 5.

Master Infiltrator

Infiltrated the mako excavation facility without being discovered once.

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You need to infiltrate the facility without being seen.

How to Infiltrate Without Being Discovered¶

This is the final missable story Trophy/Achievement in Chapter 5, and thankfully, there’s a Save Point waiting for you just outside the entrance to where it takes part. You’ll need to progress the story until you’re outside the mako excavation facility in Modeoheim, be sure to make a save here before continuing.

The facility entrance is to your right, and the goal is to reach it undetected. To make matters a little more complicated, there are chests scattered all over the area and going for them will increase your chances at being seen. The contents of the chests themselves are nothing to write home about, however, and you don’t need to ransack them to get the Trophy/Achievement, just make it to the end without being seen.

Once you start the infiltration, you should see two guards in front of you. One will walk up and down while the second will walk left to right. Wait until they both meet up in the middle and run left if you want the first chest containing a Power Attack materia. Now run over to the blue boxes, and crouch behind it, and wait until the guard walks past you. Quickly run behind him, and head to the right, and open the chest next to the skip which contains a Dispel materia.

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(1 of 8) When the guards meet up in the middle, you can run to the left to get a chest

From the chest, turn left, and run straight forward where you’ll find another chest containing some Sprint Shoes. Hide behind the wall here until the guard to your left has walked past and walked back again. Leave the hiding spot and walk forward towards the facility entrance. Before you go in, open the chest containing a Pearl Necklace, then go through the open door to the right of it. When you go through the door, you’ll get the Master Infiltrator Trophy/Achievement.

There is a temperature mechanic in this mini-game where if your body temperature drops below 26.0 you will lose a chest. There isn’t anything special here, especially if you’ve been doing other side missions, but if you do want everything, you’ll need to perform squats to keep your temperature up, just make sure to do it while in cover so you don’t get spotted.