FOX / BIG BOSS - Elite Achievement Guide - Fast & Easy

This guide covers 4 ways of how to unlock the achievement for getting either FOX or BIG BOSS as codename.
Ranked from fast & easy to easy to hard and to extreme.
You can choose between them, depending what challenge you like to have.

"In order to be able to play the japanese version you need to download the japanese language pack.
Go to your game in your library and from there, on the right side, under DLC's, select manage my DLC's and download the japanese language pack. If you start the game now, you can find under the original game the japanese version. This is the only version without a difficulty option, so basically you are playing on easy difficulty, compared to other versions."

Codename FOX (japanese version)

The fastest & easiest way to unlock the achievement is by playing the japanese version (Not Integral) and earning the codename "FOX".

On your first playthrough, you cant turn off the radar, but it doesnt matter for the FOX rank in the japanese version.

Requirements for codename "FOX":
Play time: Under 3 hours
Saves: Under 80 saves
Continue: 0 times
Alerts: Up to 4 times
Kills: Under 25 kills
Rations Used: Not more then 1
Radar: ON

Play through the game, make sure you meet the requirements and at the end you will recieve the achievement at the score screen.

This was my score screen:

Codename BIG BOSS (japanese version)

The 2nd easiest way to unlock the achievement is by playing the japanese version (Not Integral) and earning the codename "BIG BOSS".

You need to finish the game once to be able to turn off the radar in the japanese version.
Means you will need atleast 2 playthoughs.
Then you will find under "Special" the radar setting. Turn it OFF and start a new game or NG+.

Requirements for codename "BIG BOSS":
Play time: Under 3 hours
Saves: Under 80 saves
Continue: 0 times
Alerts: Up to 4 times
Kills: Under 25 kills
Rations Used: Not more then 1
Radar: OFF

Play through the game, make sure you meet the requirements and at the end you will recieve the achievement at the score screen.

Codename FOX (OG & Integral version)

The hard way to unlock the achievement is by playing the US, European or Integral version and earning the codename "FOX".

Start a new game or NG+ and choose the hard difficulty. The radar will be off by default.

Requirements for codename "FOX":
Difficulty: Hard
Play time: Under 3 hours
Saves: Under 80 saves
Continue: 0 times
Alerts: Up to 4 times
Kills: Under 25 kills
Rations Used: Not more then 1
Radar: Off

Play through the game, make sure you meet the requirements and at the end you will recieve the achievement at the score screen.

Codename BIG BOSS (OG & Integral version)

The extreme way to unlock the achievement is by playing the US, European or Integral version and earning the codename "BIG BOSS".

You need to finish the game once to unlock the extreme difficulty.
Means you will need atleast 2 playthoughs.
Start a new game or NG+ and choose the extreme difficulty. The radar will be off by default.

Requirements for codename "BIG BOSS":
Difficulty: Extreme
Play time: Under 3 hours
Saves: Under 80 saves
Continue: 0 times
Alerts: Up to 4 times
Kills: Under 25 kills
Rations Used: Not more then 1
Radar: Off

Play through the game, make sure you meet the requirements and at the end you will recieve the achievement at the score screen.

Good Luck!

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Guide written by HighRoller on Steam. Do not repost anywhere else without my permission!