This Seeking Tech tutorial will show you how to get the I Can Totally See You trophy and achievement guide in Metal Gear Solid Delta: Snake Eater.
To unlock this, you need to “achieve a Camo Index of 90% or higher.”
This can be done at the beginning of the game. First off, find a high grass location. Afterwards, equip the Leaf camouflage and Woodland face paint.
You can then go prone to lay on the high grass to get the 90% Camo Index. If you need additional help, you can take a look at the video guide below: