Pure Ninja is one of the hardest achievements to unlock while playing Far Cry: New Dawn. In order to obtain it, you must retake a level III outpost while remaining undetected. The following chapter contains various tips that will help you accomplish this task.
It does not matter which particular outpost you are going to reclaim, so choose the one that you are going to have the least trouble with. In the case of the highest difficulty level, there are going to be three alarms in the area of the outpost. However, you do not have to disarm them at all cost since they are located in well-guarded areas, thus making it more likely that you will be detected.
There are two Enforcers in each facility. Eliminating them quietly requires you to have the Takedowns talent developed to a suitable degree. Alternatively, you can also kill them with a headshot from a silenced sniper rifle while using piercing ammo. When it comes to the other enemies in the outpost, you can use any silent, elite level weapon.
Killing an Enforcer with a headshot while using piercing ammo will also unlock the achievement: It's Super Effective!.
Another important element that you need to keep in mind while taking over outposts is not raising interest. You cannot kill a bandit who is in the line of sight of one of his companions. This would result in a search, which will definitely reduce your chances of going by unnoticed. Therefore, be familiar with the patrol paths of the bandits and, if necessary, lure them to a more convenient location with the help of some rocks.
The Ghost talent can also be exceptionally useful, as it reduces the chances of being detected. This will also reduce the risk associated with sneaking up on enemies and eliminating them.