Grand Theft Auto: San Andreas – The Definitive Edition

Try to avoid the spotlights and try to kill stealthily only the necessary enemies using a knife or a silenced pistol.
Once you enter the Bunker through the Blast Doors you can continue the mission as normal.
The achievement unlocks at the end of the mission.

Before starting this mission I would recommend purchasing some Sniper Rifle ammo from Ammu-Nation. I would also recommend saving in a different save slot before doing this mission as there's no way to replay the missions unlike in GTA 5.

If the enemies detect you, just let them kill you to restart checkpoint. The Sniper is good here as you can easily take out all the enemies in the Watch Towers from far away, and the enemies walking around. The Sniper Rifle kills all the enemies in 1 shot.

At the start use your Silenced Pistol to take out the two enemies that are walking in front of you with a headshot. Then use your Sniper to start taking out the enemies in the Watch Towers and enemies walking around. Also I would recommend that you always stay crouched as the enemies might hear you running around if you get too close. Make sure you avoid the spot lights as that will alert all the enemies to your presence.

Once all the enemies have been cleared go to the control tower to open the blast doors. Once inside, you will get a checkpoint. From here play the mission as normal and the achievement will unlock once you deliver the Jet-Pack.

If you are still having trouble, feel free to use this video as a reference.


Hope this helped.

The other guides posted here give some great tips and guidelines on how to do this. However with most of them you can run into problems with the spotlights seeing you in certain places. This is because you aren't always necessary going to be able to 100% recreate what is shown in the video's. Therefore a lot of the other guides may work sometimes for some people but are not always repeatable on a large scale and could lead to frustration. I believe the following strategy utilizing the secret entrance might be the most consistent and repeatable.

Make sure to grab a Sniper Rifle and some ammo from Ammu-Nation before the mission. Some body armor for latter when you get in base wouldn't hurt either. Make sure you save before this mission at the airfield (note mission triggers between 20:00 and 06:00). I'd even make a second backup save in another slot too, just in case something goes wrong. There is no replay mission option and you probably don't want to have to replay the game up to this point.

While your sniping enemies if another enemy starts running around and heads towards you this doesn't count as a spot just make sure to kill him before he gets too close. As long is there is no mention of a code blue/red you are fine. If you do get spotted/trigger the alarm you either kill yourself with explosives or have the enemies kill you to restart the checkpoint. However I personally would just reload my save and quickly restart the mission when this happened to me. With that said when I used the following strategy I completed this first try and even tested it and was able to repeat it multiple times no problem.

The following strategy I recommend is utilized by GamerGuru in this YouTube video linked below. Just note he states to shoot only the one spotlight in his video but your actually going to have to shoot two. He actually does shoot the two required but just be aware of that and make sure to shoot them both, keeping in mind shooting 3 automatically triggers a code red.

At the start either kill as many guards as you can by sniping through the gate like in the video. Or go crouch through the gate and to the left a bit to avoid the guard in the tower seeing you. Then take out the first guard with a pistol headshot followed by the aforementioned guard in the tower just to your right. Proceed to the left and take out the nearby patrolling guard with the pistol. Followed by all the guards in the towers across from you and the ones in the middle of the map with the sniper. Make sure to shoot out the back left spotlight along with the back middle spotlight. Then continue along the left of the base hugging the wall and killing any enemies left in your path until you reach the middle back tower. Then continue just behind it and up the small hill your right. You will see a bottle on top of 2 grates which you can shoot out with the pistol to access the secret entrance. Drop down here and continue along until the next grate you can shootout. As long as there was no mention of an alarm code blue/red then you should unlock the achievement at the end of the mission. From here continue along the mission but I'd recommend disabling the Anti-Air (SAM site) to make it easier to escape which is optional.

This way worked first time for me. Just run straight in, follow fence anti-clockwise to the control tower. Push button, jump down, shoot guard, run into bunker. Takes 1min!

This achievement unlock after completing the mission, so create a manual save before starting as a precaution in case the achievement doesn't unlock for some reason.

This is pretty difficult but can be made easier with a video guide. However, an easy trick to cheese this achievement is getting yourself killed at the base and restart the mission from the checkpoint. This will glitch the mission script, making the lights stationary and getting spotted by one no longer triggers the alarm.

Unfortunately, this has a side effect of disabling "stealth mode" on the radar, replacing the enemy icons with squares that do not indicate the way the enemy is facing. From then, just take your time killing everyone from a distance. The sniper makes this very easy, but it can sometimes be tricky to line up your shots on moving targets at the game accounts for bullet travel time.

Once everyone is taken care of, open the doo6r from the yellow marker and enter the bunker. At this point, the alarm will trigger automatically and you can get spotted without voiding the achievement. Simply finish the mission and it will unlock on the Mission Passed screen.

Make sure to pick up a silenced pistol before starting this. Once the mission begins snipe 3 guys in the towers before entering the gate and the guy nearest to the gate on the ground. Then just slowly progress through the middle taking out everyone in your way with a silenced pistol. Once the gate is open sprint to the underground, you shouldn't be detected if you take everyone out. Then just complete the mission as normal doesn't matter if you get detected. If you get detected above ground just die and try again.