The Outer Worlds

The trick with this one instead of trying to switch between all 4 weapons equip two on your companions. I did one with the melee weapon, and another with the shrink gun, and kept two for myself. Find a semi tanky mob like a mantiqueen or soldier, and attack. With a little practice you can get it very easily.

There is 5 science weapons, you only need 4 of them. Them being the Prismatic Hammer, Gloop Gun, Shrink Ray, Mandibular Rearranger and Mind Control Ray. If you need help finding these weapons, James Billcliffe has a good guide that you can find here.

https://www.vg247.com/2019/10/24/the-outer-worlds-science-we...

You can either give a weapon to each of your partners, or try and do all four weapons by yourself, which I wasn't able to do. I went with the giving weapons to each partner method. Gloop Gun to one, Shrink Ray to the other and used the Mind Control and Rearranger. Also, TTD is a must. When the enemy gets glooped into the air, slow down time, hit them with the rearranger and then use mind control, if luck is on your side, your other partner will use the shrink ray.

PS- I just had the 2 science weapons equipped and nothing else, it is quicker and easier to switch weapons that way.

Hope this helps!

In this video guide I will show you how to kill an enemy under the effects of 4 science weapons. First I will show you where to find all 5 just so you can have them all.

Shrink Ray - 00:04 - 00:31
Prismatic Hammer - 00:32 - 01:30
Mandibular Rearranger - 01:32 - 01:58
Mind Control Ray - 02:01 - 03:20
Gloop Gun - 03:22 - 04:14

Now that you have the weapons, it's time for the setup.
First your going to want to go into your partners behavior page and set the distance to far, the weapon to ranged, and mode to aggressive. This way they will shoot on site and not melee. Because the way I did this was gave them the ranged weapons while I used the melee weapons.

The area I tried this as in on Monarch right next to the Casscadia areas. Once you get here make a manual save. There will be a nice path along the cliff side with a lot of enemies. Stick to the road and follow it up until you see an enemy on the left. If you stick to the road it will be directly in your path.

The easiest way for this to work is when you see the enemy, make sure you can give your companions the attack command on it. So make sure they are close by before attempting. Once you are ready press UP on the D-Pad to give the order. Once they start shooting go up and hit the creature with the first melee weapon a few times, then switch to the other one and hit it a few more times. If it don't pop reload your manual save and keep trying until it does. You will know if it is working or not by looking above the enemies health bar, you should see symbols there. These indicate that the enemy is currently getting affected by the effects of your weapons. Once you see 4 symbols, the achievement will pop. If you are having troubles you can always use the 5th weapon to make it easier.

Following the "Weapons From the Void" quests and buying location datapads from certain people will get you to the locations of the Science Weapons, however you can just go to their location if you want without dealing with any quest direction.
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- First you must acquire at least 4 of the 5 Science Weapons (shown in the video):
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​Once you have at least 4 of them follow this set-up:
- Hold the Hammer & Rearranger in two of YOUR weapon slots, and leave the other 2 empty (makes switching b/w them easier)
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- Go to the menu and choose your 2 Companions to use range attacks opposed to melee and make them aggressive so they attack what you attack
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- Give each one of your companions one of the Ranged Science Weapons
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NOW - find a chonky enemy (ex. Mantiqueen on Monarch) that can take some heat, run up and hit them with each of the melee Science Weapons while your companions hit them with the other 2, causing you to get this achievement!
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- You could always find the 5th to give yourself an even better chance but it is not necessary

SCIENCE WEAPON LOCATIONS:

-- Prismatic Hammer (02:17) ------
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- Groundbreaker | Just past the security room on the left you will find a worker's sleeping area. If you climb boxes you can get into a sneaky hole in the room that will lead to a bigger room. There will be a locked door on your right (Key Card on enemy in the room), behind it is the hammer
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-- Shrink Ray​ (03:13) ------
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- Phineas' Lab | Very easy, just in a box inside his lab. Travel there and pick it up.
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-- Mandibular Rearranger (04:01) ------
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- Scylla | On the East side of Scylla near the Abandoned Mining Outpost you will find this weapon in a nearby building
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-- Mind Control Ray (04:46) ------
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- Rizzo Secret Lab, Cascadia | It's near the terminal you access during the "Space-Crime Continuum" side mission for Lilya Hagen of SubLight.

To the left of the terminal you will see a platform you can jump to, jump up the path of platforms to find the box containing the Ray.
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-- Gloop Gun (06:28) ------
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- UDL Lab, Monarch | Part of the "Errors Unseen" side quest & "Radio Free Monarch" main quest.

There is a Terminal in the UDL Lab (SE of Stellar Bay) that you can hack or answer security questions to unlock the gun.

You may get stuck on the other side of the lab where it is locked...go to the other side to get to the lab. Once there go up stairs to get the Key Card to be able to use the Terminal below. You can hack it (Skill 55) or Answer 3 Questions to unlock the Gloop Gun.

The answers are:
"Protect the Chairman",
"Berate him relentlessly to defend the Chairman’s honor",
"Arrest your spouse and admit your children to a reeducation program"
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All of my HD Achievement Guides for The Outer Worlds can be found here! :) (Mobile Friendly)
https://www.bradleafsfan9.com/the-outer-worlds

As soon as you can travel in your ship, go to Phineas' lab for the Shrink Ray (Ranged Weapon). It is on a table to the right of where you interact with Phineas. Give it to Companion 1.

Groundbreaker. Enter room with storage boxes on left immediately past check-in/security. There are two doors, enter the unlocked door which contains beds. Jump on crates to your left to get on top of the sleeping compartments and go through opening at the end. Defeat enemies, open door next to the workbench, and take Prismatic Hammer. Equip in Slot 2.

Scylla. Defeat mechanicals at Abandoned Mining Post and take Mandibular Rearranger (Melee Weapon). Give it to Companion 2.

Cascadia Landing Pad on Monarch. There will be warnings about it being dangerous and Phineas will attempt to talk you out of it! While still on the landing pad, go behind your ship so that you are facing the canyon wall. Sneak and kill the two smaller raptidons. The large raptidon will run away. Your companions should not interfere if you kill the small rapts quickly. Defeat the enemies around the base of the ramp - sprats and more raptidons.

Now, just run to Stellar Bay without fighting any other enemies. At Stellar Bay, exit through the Stellar Bay Ruins (South) door. Run until you get to Amber Heights. Before the Blown Bridge, take path by the campfire up the hill on the right side. The UDL lab will be on the right at the top. Get the Gloop Gun and equip in Slot 1.

Fast travel to the Cascadia Landing Pad. Go into your companions' menu and ensure the one with the Ranged weapon has Ranged weapon as their preferred mode of attack. Verify that the companion with the melee weapon has Melee weapon as their preferred mode of attack.

(Save your game here before proceeding.)

Run around base of landing pad with Gloop Gun ready. Blast the large raptidon (the rapt that ran away earlier) then change to Prismatic Hammer. While the rapt is in the air, one of your companions will begin using the shrink ray. As soon as the rapt nears the ground, give it a good swing. You and your second companion should both hit the rapt at the same time. I didn't actually see Parvati strike the rapt, but the achievement popped immediately.

Good luck!

The achievement unlocks when you deliver the coup de grace to kill an enemy while it is under the status effects of at least four different science weapons. The science weapons can be equipped on the player-character and/or one or both companions. There are 11 science weapons in the game—5 in the base game and 3 in each of the two DLCs. However, the Employee Benefits handgun does not work on hostiles—its purpose is to heal allies—so only 10 science weapons are available for the achievement. The duration of their status effects is very brief. To ensure the target is inflicted with four different science weapon status effects, it helps to equip science weapons on both companions.

The 11 weapons are as follows:

1. Gloop Gun: Heavy Weapon—Recommended for the achievement
2. The Needler (Murder on Eridanos): Handgun—Recommended
3. Spectrum Gatling (Murder on Eridanos): Long Guns—Recommended
4. Special Delivery (Peril On Gorgon): Heavy Weapon—Recommended; equip on Vicar Max
5. Mind Control Ray: Long Guns—equip on companion
6. Shrink Ray: Handgun—equip on companion
7. Mandibular Rearranger: 1-Handed Melee
8. Prismatic Hammer: 2-Handed Melee
9. The P.E.T. (Peril On Gorgon): 2-Handed Melee
10. Udder Buddy (Murder on Eridanos): 1-Handed Melee
11. Employee Benefits (Peril On Gorgon): Handgun—Cannot be used for the achievement

If you have an unadjusted Medical skill of 60, the status effect of all weapons including science weapons is increased by 50%. Your adjusted science skill increases the duration of the effects of the Gloop Gun and the Mandibular Rearranger.

If you are playing both DLCs and do not mind waiting until late in the game before unlocking the achievement:

The Needler is acquired late in the game towards the end of the Murder on Eridanos DLC. Nevertheless, it is a very good weapon for the achievement. I recommend equipping the Gloop Gun and the Needler on the player-character. For the other two science weapons, I recommend taking Nyoka and Vicar Max with you. Equip Nyoka with the Spectrum Gatling and Max with the Special Delivery (his science skill increases its range).

Having obtained and equipped the four or more science weapons you intend to use for the achievement, target a large enemy. The enemy must be robust enough to become afflicted with the status effects of the 4 science weapons before succumbing. A good location is Fallbrook on the Planet Monarch using the mega-Mantiqueen on a small island just left, in the river, as you exit Fallbrook and cross the bridge. I like to use the mega-Mantiqueen because of its slower speed in comparison to other large enemies.

Assuming you are using the recommended setup, direct both companions to defensive so they will only attack on command. Set them to ranged and medium distance. Ensure you have a good long-range, non-science weapon in the active slot (the Deadeye II/III or a Hunting Rifle Hyper are my recommendations). Equip the Gloop Gun and the Needler in the 2nd and 3rd slots.

Head out the main Fallbrook gate. If you’re playing on supernova, this will create an auto-save. If you are playing on a different mode, create a manual save closer to the action. Take a left into the river as soon as you cross the bridge. A little ways in front of you is a mega-Mantiqueen accompanied by several Mantisaurs and/or Mantipillars. Ideally, kill the lesser enemies at a distance from stealth using your long-range sniping weapon.

After all lesser enemies are dead, switch to the Gloop Gun as the active weapon. Unequip any weapon other than the Gloop Gun and the Needler. If you are not playing on supernova, make a manual at this point. If you are playing on supernova, you may want to pop in and out of Fallbrook to create an auto-save—the achievement may take more than one try.

Ensure the mega-Mantiqueen is not alert. Sneak up behind it until you are in the Gloop Gun’s range. As soon as the enemy is launched (one of the Gloop Gun's effects), switch to the Needler, direct your companions to attack by pressing up on the d-pad , and go into TTD. Fire the Needler slowly taking your time between shots. You can check the enemy’s status bar to ensure the status effects are active. While in TTD, the info panel on the bottom left of the screen provides a clearer display of the status effects. Once the mega-Mantiqueen lands, switch to the Gloop Gun. Return to the Needler when it is launched again.

By alternating weapons in this manner with your companions contributing with their two science weapons, you have a very good chance of killing the mega-Mantiqueen while under the effects of four weapons and the achievement will pop. However, the effects wear off rapidly and it is possible that the enemy will expire at an inopportune time. It this happens, load your save and try again until you unlock the achievement.

If you are not playing the DLC(s) and/or want to unlock the achievement earlier in the game:

If you want to get the achievement as early as possible, equip the Gloop Gun and the Mandibular Rearranger (or The Prismatic Hammer) on the player-character. I prefer the Manidibular Rearranger because it attacks more than twice as fast as the Prismatic Hammer and has a faster equip time. it also has the effect of slowing down or freezing the enemy which helps with the achievement. However, it is found later in the game on Scylla while the Prismatic Hammer (Groundbreaker) is the first science weapon available.

Equip the Shrink Ray and the Mind Control Ray on the companions of your choice. As before, direct both companions to defensive so they will only attack on command. Set them to ranged and medium distance. The Fallbrook mega-Mantiqueen is still a good target. Once you have dispatched the lesser enemies, created your auto- or manual save, and have equipped only the Gloop Gun and Mandibular Rearranger (or Prismatic Hammer) sneak up to the enemy with the Gloop Gun equipped.

Attack with the Gloop Gun and direct your companions to attack by pressing up on the d-pad . Switch to your melee weapon and approach the enemy launched by the Gloop Gun. Just before it lands, go into TTD and attack with the melee weapon. As soon as you see the enemy afflicted by the status effects, exit TTD, switch to the Gloop Gun, and launch the enemy again. Once more, switch to the melee weapon, approach the enemy, and wait until just before it lands before invoking TTD & attacking with the melee weapon. Repeat this cycle until the enemy dies. If the achievement does not pop, reload your save and try again until it does.

The reason you equipped the Shrink Ray and the Mind Control Ray on your companions is that they must constantly target the enemy to be effective. The companions’ AI is very good in this regard. The player-character, switching between weapons, finds it difficult to ensure both mind control and shrinkage remain in effect. Moreover, ranged weapons are better than melee weapons to barrage an agile enemy and ensure the status effects are constantly refreshed. Our preferred setup uses only ranged weapons because they have no difficulty targeting a launched enemy.

Whatever your tactics, this is one of the more challenging achievements. You may want to tinker with the weapons to make them more powerful. However, you do not want them too powerful so they kill the enemy before all four have inflicted their respective status effects.

The DLC science weapons do work for this achievement.

I sold two of the science weapons from the main game long ago and didn't have a save before I sold them but when I recently played through the two DLCs (Peril on Gorgon and Murder on Eridanos) there are 6 total science weapons I acquired.

I followed the other guides here and put a science GUN on each of my companions and had them only using guns as their behavior. I bumped my medical up to 60 in order to get the perk for 50% added effects duration. And then I actually just put 4 different science weapons on me.

I had this set up against the final boss of the Murder on Eridanos DLC on Easy difficulty. I just kept switching between my 4 science weapons that I personally had equipped and letting my companions shoot away with their science guns and the achievement popped when I killed the boss.