The Callisto Protocol

The Callisto Protocol

47 Achievements

24-32h

PS5
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Big Game Hunter

Big Game Hunter

Complete Wave 50

0.1%

How to unlock the Big Game Hunter achievement in The Callisto Protocol - Definitive Guide

Edit: Do not activate the perks in the starting room on subsequent plays as it may make all Riot DLC achievements unobtainable for you. I was able to fix this by uninstalling and reinstalling the game as well as a hard reset of my console.


  • In this mode you can only carry one primary (Riot Shotgun or Assault Rifle) and one secondary (Hand Cannon, Skunk Gun, or crappy useless pistol). For that reason upgrade the riot shotgun and hand cannon your first play through and stick with those weapons. They are the cheapest and most effective options. If you buy another weapon you’ll lose all of your accumulated ammo.
  • You'll want to spend most of your time on the second floor of the main room. The room has spike traps and you’ll quickly memorize the spawns. The only time you should leave is to go to a buy box or for an objective. From wave 40 onward I would not recommend leaving at all. If you get caught in a narrow hallway during one of the waves of all suicide exploding monsters that can end your run.
  • The main dangers you’ll face during this is the security unit and two head enemies. Unlike the campaign neither can insta kill you but there are several waves where multiple spawn and it’s possible for them to stun lock you until you die if you get attacked by multiple at once. Two heads appear on waves 20, 30, 40, 42, 44, and 50. On waves 40, 44, and 50 two may spawn in at once along with a security bot. I ended up getting caught between all three of them and was was stuck in the dodge animation until I died without being able to move or fire.
  • The new rampage mechanic allows you to insta kill anything while it’s active and is most effective when used at the start of a round or when getting swarmed. It’s important to make sure you have it ready prior to any rounds with a two head or you’ll end up draining a significant amount of ammo. This is especially true for rounds with multiple two heads.
  • Don't bother with the traps. They’re a very easy way for you to insta kill yourself, expensive, and don’t work well.
  • Conserve your ammo as best you can for larger enemies. If you face a security bot or two face with no ammo it’ll basically be game over. When you initially get your weapons upgraded you’ll have a lot but the only way to get more is to rebuy the final upgrade for the weapon or complete objectives. when you complete an objective it will give you ammo for whatever weapon you have equipped.
  • initially spend your money getting your GRP and Stun Baton upgraded because you shouldn’t be using guns at all in the early rounds. The higher you go more medgel and GRP recharge packs will cost and it’s beneficial to stock up on those medgels early on if you can
  • The side objectives vary wildly in value. Some like get the next 4 purchases refunded can potentially be worth 20,000 credits and be easy while others can be difficult and only reward 100 credits. Pick and choose which you want to pursue but I don’t think they will make a significant impact on your run.
Activating the perks will break your game.
If you died on your first attempt you’ll have upgrades unlocked (depending on score) which include having health increase by 4% each wave, getting a shotgun shell for each enemy killed with a shotgun, and getting ammo for every item you buy. Go ahead and equip those 3 and get the Skunk Gun and Riot Gun as quick as you can and it’ll be close to having infinite ammo. When I finished my second run I had several hundred rounds for both, 50,000 credits, and over 10 med kits/GRP.
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25 May 2023 07:00

13 Comments
maybe using perk from first room disebled this achievement.I end on 52 round and nothing poped.
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By Czesio83 on 25 May 2023 13:38
After the first game I activated the bonuses and it stopped tracking all the achievements as well as not unlocking anything. I recommend not activating because I had to literally close the game to get it working again. I think it's related to the bonuses you activate.
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By ox BlackJack xo on 25 May 2023 17:24
You’re right the perks will break this achievement. I’ve done three runs now (two without perks and one with) and it still hasn’t unlocked even after restarting my Xbox before the third run
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By Nacho on 25 May 2023 18:29
The starting boosts didn't void any achievements for me. The first run of mine was just a quick run to see what the mode was like. I got to wave 19 and got three of the achievements (5 waves with no purchases, complete riot mode for the first time, kill a two head with a hazard). When I finished I saw that all the boosts were available.

My second run I went for the rest of the achievements and I turned on as many of the boosts as I could (3). They were at low heath you heal 4, every 4th hit is 3x damage, and chance of ammo on dismembering. All achievements unlocked as they should have. The 20k spent unlocked first (cumulative, included amount from first run) then the 100 cumulative dismembered limbs at some point second, then wave 50, and finally 10 rampage (cumulative again). No issues with any unlocks and I went to wave 65 but got careless/bored and died surrounded by 3 or 4 two-heads.

I run combat assists (accessibility settings) because I've done the hard yards and wanted a breezy stress-free experience, and I did it online on my Series X.

It was all pretty easy to be honest, it just takes time and patience to get to wave 50. My upgrade progression was as follows:
- Fully upgrade baton
- Fully upgrade riot gun
- Alternate upgrading GRP and hand cannon
- In amongst that buy the odd health and GRP battery. I kept around 10 injectors and 7 batteries at any one time but I didn't need anywhere near that many since you can buy a new injector and battery every wave and there are multiple locations where you can buy these.

By the end of wave 50 I had over 120 riot shells and hand cannon rounds, each. Ammo conservation was never an issue for me, I had so much and as just blasting away as I went for the fun of it. I thought I was upgrading my gun more and more but I think I was just buying more and more ammo/ammo capacity. Money was never really an issue either because I had always kept my multiplier up and was completing challenges so later in my run I could buy whatever I wanted pretty much whenever. I even bought the tac pistol and assault rifle after wave 50 to mix things up and have some reckless fun, though the riot gun and hand cannon are definitely the best weapons to have. Honestly, I think the mode should have started off with only the stun baton and nothing else and you buy what you want to use as you go.

I did go melee a lot because why not, especially on weaker enemies (and in the first 10-20 waves and for some challenges) but after that I was equally blasting away with guns and going melee because sometimes I felt like melee and others I just blew away large groups. I had so much ammo it didn't make a difference. Plus with melee and combat assists and the fact that enemies take their turn when it comes to melee combat, rarely was a large group of enemies an issue, unless there are bots and two-heads, though they usually come at you solo for the most part)

BONUS OBJECTIVES ARE GREAT, and as the solution suggests, pick and choose, but most you can do with your eyes closed they're that simple and it's rarely so hectic that you can't just run around completing these bonus objectives, especially early in the runs. They can be very beneficial early in your runs. If you're running around, just run and listen, if the footsteps sound close, turn and shoot/dodge and keep running. Enemies won't follow your through doors, they will go through floors and vents and respawn in the room you're in so once you know where they spawn out of, you can make easy work of running through the area.

The arena is also a giant 8 with two upgrades in each for the 4 connector areas. I also recommend not removing the battery in the door upstairs as it's handy to have that door open when running around and completing challenges.

To make it interesting, I ran all over the place but I was mostly in the main central area on the top level where the health dispenser is. You can shoot all the exploding elements from there. Word of warning, two-heads spawn around there so be careful (though you can easily drop down). I also like the corner where the hand cannon and power cell are, nothing can come behind you and there are two areas where they can come. Might not work for you but it worked for me.

Again as the solution mentions, you can only have two weapons at a time so if you buy an assault rifle for example, you will replace your riot gun and lose all your accumulated ammo for that gun. If you buy it back you get the stock 30 rounds give or take and have to rebuy all your ammo again. The AR and riot gun replace each other and the tac pistol/hand cannon/skunk gun replace each other.

Bots are easy, 3 or 4 headshots with the hand cannon will do them (depending on its level) and the riot gun is pretty much a two shot kill. Two-heads, I recommend rampage mode if there are more than one or just keep shooting them until they die.
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By xDAKx on 27 May 2023 05:57
I didn't have any problems using the perks and achievements unlocked fine for me. I don't think I would have got to wave 50 without them.
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By pantyhamster on 28 May 2023 09:14
Wave 50 achievement becomes unobtainable
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By Hiró Obunâga on 02 Jun 2023 12:33
I used three perks (Reduce Damage By 10%, Gain 4 Max Health Every Wave, Gain Ammo On Any Purchase) and it didn't unlock; got to Wave 52 and then waited for Jacob to be killed. However, I paused twice during this run to do other things and so ended up using Quick Resume twice. Maybe that had an effect? Or makes unlocking less likely if it's a bit glitched?

MrReign's video on YouTube uses the exact same set of perks so it has been unlocked with that combination. Probably just a bit hit and miss (not to say that's okay). I'll try again in one sitting and update this post with the outcome.
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By G2covers on 06 Jun 2023 13:20
Achievements unlocked with perks mentioned above. 20k credits, two head, 10 devastation, and 50 waves achievements unlocked with 3 perks activated.
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By Eclipse GX on 07 Aug 2023 11:15
Unlocked it with 3 perks on too. Might it have been fixed?
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By Chief Redrum on 06 Sep 2023 23:39
9/18/23 I used 3 perks and got the beat wave 50 achievement ...
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By KILLING5PR33 on 18 Sep 2023 12:15
Just unlocked using the perks without issue too, presumably been patched.
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By Slam Shot Sam on 28 Nov 2023 23:38
I was using 3 perks and achievement do not pop. Still bugged. Other achievements was done without using perks and works fine
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By KaZzzidze on 01 Jan 2024 17:14
Used 3 perks on my second try. Popped.
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By PH1 HUNG on 01 Mar 2024 08:57
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It's not that difficult to get through. We have a lot of health. We simply pump in a baton, a machine gun and a pistol as desired. Then you can only spend money on first aid kits. I hardly used the glove. We try to complete tasks that kill the enemy as a bonus. But this is optional. We use rampage more often + . After the first death (PS. Died on the first wave and the modifiers did not open. You need to live longer. Most likely after 5-10 waves), you can select up to 3 modifiers in the starting location, which will make the game even easier. The most useful in my opinion: damage reduction by 10%, healing on reload and the third hit deals triple damage.
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23 May 2023 22:12

2 Comments
One rule if you want to pass the first time - do not turn on the traps.
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By Himself8989 on 26 Mar 2024 14:22
I completed it twice on PS4 and 5 and passed it both times on the first try. 50 waves will take from 2 to 2.5 hours. Passed without a single mod. At wave 50, 50,000 credits had still accumulated and there was nowhere to spend them.
1- in the first waves, do not spend credits; there is a prize for this.
2- the very first thing that is better to spend money on is a baton for max. and the glove to the max, so that later you don’t have to climb or look for where these improvements are located (this mode is partially similar to a labyrinth).
3- then download to max the police d-k and single-shot pistol (with them, all 50 waves lasted, there were still spare cartridges left).
4- for myself, the best place for defense was a dining room with two fans and a fire (it’s easy to hold all 50 waves there). The trump card in this room is the distribution stand, if two-headed rods can jump over it, and two-headed ones go around it for a long time, and a thick column behind which you can hide from shots helps a lot from robots.
The 5-charge on the glove was used only on crawling kamikazes.
6- kill all the standard opponents, and push the two-headed ones into the fan to save ammo.
7- boost mode, starting from wave 30, keep it for a critical case (this mode kills everyone with one hit or shot).
8 - a baton pumped to the maximum causes a lot of damage to opponents; it is better to use it more often, and leave the cartridges when robots and spitters are clamping down.
9- starting from the 15th wave, when temporary tests appear where you need to run and look for something, DO NOT run away from the dining room because you start to split into two and find something you need to kill your opponents (increases the chance of death).
10 - on wave 51, you can get into the fan to lose your life faster.
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By Diman12345 on 05 Dec 2023 23:08
The ideal place for grinding waves is a corridor with a red light with two chests, one of which contains an upgrade for Skunk. Most of the enemies come from one side and are easy to shoot. you can wait for the robots from around the corner and knock them out in one shot (very useful when the four of them were leaving, again, from the same door. A first aid kit for 650 is within reach - there is clearly enough time between waves to run, buy and return . Thanks to this location, I got the necessary perks the first time - ammo for killing with a shotgun, reducing damage by 10%, the third time doesn’t matter at all (I took +2000 credits for shooting a robot.
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09 Jul 2023 14:45