Serious Sam 4

Serious Sam 4

54 Achievements

1,000

8-10h

Xbox Series
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Serious Sam

Serious Sam

Beat the game on any difficulty.

100

2.78%

How to unlock the Serious Sam achievement in Serious Sam 4 - Definitive Guide

For this you need to complete all missions. This guide will mostly just be a guide for completing the final boss since I wrote guides for all other campaign mission achievements. So watch out for spoilers down below.

First, to make this easier make sure you have infinite ammo turned on and even tourism difficulty or play on co-op and set respawn timer to 0.
In the final mission you will need to get to the main battle arena, the main issue will be the final boss. Once you get to it you will get a grappling hook and parachute. You can use the grappling hook by pressing in the right thumbstick and the parachute works automatically as you fall. Use this grappling hook to launch yourself to what looks like purple tesla coils, don't even bother shooting the boss until all 9 of these are destroyed. You destroy them by launching and detonating c4 charges on these coils. 8 of these will be at identical locations on the bosses left and right side. 4 on left and 4 on the right. A few of these are on the legs, back of his hands, his lower back, and his arms. The final one will be found on the top of his head which is more easily accessible coming from the back of him and not his horns. Once all 9 are destroyed, parachute to the ground and get into the mech to finish him off and upon mission completion you will get this achievement.
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2

08 Dec 2021 04:19

11 Comments
Just to clarify things, infinite ammo is only available as an option if you select the following:

Cooperative > Classic > Customize Game

Selecting Customize Game will bring up a long list of various options, including being able to toggle on/off infinite ammo. Hope that clears up confusion around this.
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By Korean B B Q on 10 Dec 2021 18:02
I completed the game but jo achievement...
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By El Moono 360 on 20 Dec 2021 10:07
A glitch maybe?
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By Its Jing Wei on 21 Dec 2021 18:53
Just seems odd. Just won't unlock. Hope I don't have to start whole game again
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By El Moono 360 on 21 Dec 2021 22:58
Yup, same thing just happened to me. Beat the campaign and no achievement.

EDIT: ok, got them both to pop. If you're on Series X, make sure you don't have Quick Resume on when you do the final mission. I think that had something to do with the last two achievements not unlocking immediately. I restarted the final checkpoint 3 times (right before you get into the mech) before they finally popped.
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By The SCHWARTZ 00 on 22 Dec 2021 14:25
Ah brilliant, cheers. Will check that out.
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By El Moono 360 on 25 Dec 2021 17:16
How do you get rid of quick resume
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By El Moono 360 on 25 Dec 2021 17:37
Press the Glowing button on your controller, click my games and apps, scroll down until you find the "Quick Resume tab" Press the 3 line button on it and choose "Remove from quick resume"
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By Its Jing Wei on 25 Dec 2021 19:47
Still struggling for this to unlock. It loads up normally but also instantly gets added to quick resume. Guessing that shouldn't matter but yeah played all way through last level no achievement
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By El Moono 360 on 29 Dec 2021 00:45
Still not working so just must be me. Ah well.
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By El Moono 360 on 09 Jan 2022 12:37
I did this Boss on my 4th attempt, without using Infinite Ammo, as Single Player. The trick is, ignore the things shooting at you, you'll just keep dying! just keep moving, & grappling when you see a purple node, c4 it, & jump away from the boss, rinse & repeat. It's doable, just keep moving...
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By Xrs27 on 10 Sep 2022 14:51
View all 11 comments Show less comments
Complete All These Missions on Any Difficulty

0.Man Vs Beast
1.Death from Above
2.Death from Below
3.Four Horsemen of the Apocalypse
4.Gates of Hell
5.The Die is Cast
6.Morituri Te Salutant
7.When in Rome
8.Machina Ex Deus
9.A Breakfast in France
10.One for the Road
11.Vive La Resistance
12.In Carcassonne
13.Anathema Unto God
14.The Package
15.From Earth With Love
1
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01 May 2023 23:19