The Ascent

still missing 438 hung... what a frickin mess, how long has it been since release day? 3 months? pathetic devs.

Same, got Comprehensive but missing 438 Hung only, I will like confirmation about a future fix for this if, not then I'll start a playthrough hopefully getting all including 438 Hung

@DemonicChip9868 I tried searching for this. I found more players with the same issue on some of the forums but no word on a potential fix, unfortunately. So, I don't know if the devs are working on it.

I wish I had more info for you. The best thing to do right now is to submit a bug report and hopefully they will fix it asap. I will update the guide when I know more.

Maybe it has something to do with the fact that 438 Hung is listed in BIOS, not the Enemies?
Flatliner is the only achievement that I'm missing.

Just finished the game today and this is the only achievement left for me, stuck at 96% missing 438 Hung. I hope they fix this soon

Missing out on Celine. Do I have to replay the whole game now, or is it possible to trigger this fight again?

@Borshajen I am sorry to hear that. Any idea what could cause this? I have done 4 playthroughs - although all single-player - and I didn't experience this once. I would like to know what people can do to mitigate this.

Either way, the devs are aware of this issue and as I mentioned in the update they are currently working on it for a future patch. So hopefully, that will finally fix it for everyone.

I have the exact same list and stuck on 96% also.
Do bounty enemies count?

@Silver2020Smurf I did explore the world quite a bit, but of course it's possible that I (we) missed something. Anyway, thanks for helping! 👍

Hmm, I've beaten the game, and I have everything on your list except 438 Hung. I'm at 93%.

I'm also missing 438 Hung and hes the boss in one of the missions so i cant even go back and kill him again.

Missing 438 hung too and have killed him

Missing 438 hung too...

Could there be codex entries from datapads?

@aCommonVirus I read every datapad I come across but so far none gave me an entry.

Same list and also stuck at 96% :(

Dakyne is not in the enemy codex after killing her during the final fight, that's my bet.

i agree, i think that dakyne is supposed to be in the codex but for some reason isnt

Missing a Scatter.

Lots of people randomly have one entry missing from the codex, not necessarily from the enemy list. It doesn't seem to affect the percentages nor whether the achievement is glitched or not though, they're both still glitched for everyone.

I got all enemy codex but no achievement still i’m stuck at 96%

Dark alliance flashbacks

Make sure you guys all hop onto the bug reporting page for the game and report issues. Many achievements are bugged:

https://docs.google.com/forms/u/0/d/e/1FAIpQLSeL8E4yB2Ey_kh3...

Definitely Dakyne since every other bosses have their codex entry

Stuck at 96% after 2 complete playthroughs, 1 with solo/co-op and a second 100% solo (no co-op).

Thanks for the update. Submitted my report to developer.

FYI - I only have a single character. Progress stopped on a couple of achievements. My guess is this is from playing Co-op. I have all the entries and the achievement is stuck at 96%

Also stuck at 96% only cheevos I have left are Flatliner, Comprehensive and For Both our Benefits. 2 of which are tied to codex issues and the mission rescue ubi is broken. Will head over to the bug page now.

Forgot to mention, for the 2 achievements Flatliner and Comprehensive, this is the first time I've ever seen "0.00% of gamers unlocked this" that's clear proof something is wrong there.

Definitely bugged. I'm stuck on 96% as well. Single character, haven't played co-op yet so I don't think that is what's breaking it. Looks like I never got my codex for Dakyne so could very well be that.

An update is just live. Around 6gigs. Hope the bugged achievements are fixed as a part of it

@supkris No extra Codex entries after the update so far, at least not for my current character. The only thing I noticed was the added difficulty slider in the settings.

I check my enemy codex and i dont have the 438 hung, but appears on the bio and i already beat the game :/

Yup - 438 Hung is in "Bios" section of the CODEX, not "Enemies".
I got everything else from that list and my progress stands at 93%.

@wreddny maybe is because we killed the companions and he surrended?

did anyone try going playing through the final fight post-patch? Dakyne is not on the list

The patch just brings it up to speed with the Steam version, which has all the same bugs as the previous version including broken achievements.

@DonBartski I have the same problem.

I had been using trueachievements for a long time, but registered only today, to rant about this achievement.
XGP PC version, stuck at 96%. Same boat as others pointed out above.

AUGUST 6TH STEAM PATCH NOTES

The following summary covers the key areas we have addressed in this new major Patch update for The Ascent on Steam.

This update is now available for The Ascent on Steam, and the same patch will also be landing for Xbox and Windows 10 players shortly.

Our team is continuing to work hard on improving the game and we are very grateful for all the support and feedback from our players.


Performance (PC Steam & Win10 only)

Fixes to improve performance in DX12, also with Ray Tracing.

Note to Players: on first running of the update, there will be a 20-25 second ‘stall’ on loading to Main Menu to allow some caching to happen before you play. This is a one time event.

Ray Tracing is now available to Players on the Windows Store.

Improved loading in of NPCs

CPU performance mode for lower-end PCs



Stability (all platforms)

Numerous instances of ‘one time’ crashes have been fixed in both Single Player & Coop on ALL Platforms. (some other instances remain, we are working hard to resolve these for the next update).

Local Coop fixes where Player 1 and Player 2 have controller focus issues on certain menus.

Numerous other crash-fixes have been made to improve the stability of both local and online Coop, including fixes when disconnecting controllers, issues when 3 Players start a new game, and fixes when the internet connection becomes unstable.

Fixed an issue where in certain circumstances a black screen would appear at the end of Mission 12.

Fixed an issue where sometimes it takes too long to return to the Main Menu after gameplay.

Fixed issues where Area loading is slower for the Client joining the game after the Host is using the Taxi.

Fixed some Weapon replication issues in Online Coop.

Fixed some issues around cross Platform hotjoining where Clients had trouble connecting to the Host.



Save Progress (all platforms)

Introduced a new system to circumvent situations where save files could become corrupted.

Fixes to situations in Coop where the Host leaving the game could cause the Client to lose progress.

Fixes to situations in Coop where Players may experience progression blockers in certain situations.

Fixed the issue where a Client's items would unequip after a Host disconnects.

Fixed an issue where a Client may lose connection when hotjoining a game in progress.



Gameplay (all platforms)

Fixed an Achievement issue where you could unlock Main Mission and Side Mission under incorrect conditions.

Fixed an issue where the mission objective during ‘Go To Grinder’ in Mission 2 would not update.

The issue where multiple bosses could spawn has been fixed. e.g. Papa Feral, Megarachnoid (Spider Boss), Gun-Dolph.

Fixed the Casino Courier Side Missions 1 - 5 where you could sometimes be unable to proceed due to missing NPCs.

Fixed the custom camera for ‘Dark Horse’ Side Mission.

Fixed the custom camera for Bartender in Stimtown.

Fixed the situation where sometimes ‘Dark Horse’ could not be completed due to the NPC remaining in a frightened state.

Fixed an issue where the Volatile Augmentation when used on neutrals had no effect.

Fixed an issue where the Siege Mech in the Prison could despawn after a Player died.

Fixed the issue where the Snooze Dealer’s Journal map icon was a white square.

Fixed damage scaling on the Pocket Mech minigun to make it more powerful as you level up.

Allows the use of certain augmentations while rolling.

Balanced cost/cooldown/efficiency of Life Transfer, Neutron Beam and Overclock

Fixed issues with PLUG Cyberdeck not cracking ICE 1.



Translation (all platforms)

Lots of fixes have been made to address instances where English would appear instead of the correct language.

Further work is continuing to improve the quality of the translations as well as further general bug fixes.

Fixed an issue in Japanese where text overlapped in the intro cut-scene.



Assorted other fixes (all platforms)

Fixed an issue where sometimes in Dreamworld, shooting SFX without enemies being present could be heard.

Fixed an issue where the death-screen replaced the SFX & VO after defeating the Megarachnoid.

Cyberdeck visible in Journal

News now plays in the Taxi

Film Grain toggle added to the Graphics menu

Fixed the Dismemberer shooting SFX that could be missing for Clients.

Fixed previews for Auto Turret and Pocket Mech in Vendors.

Fixed Cluster 13’s Metrolink entrances collision box.

Various UI fixes.

Another word they still not fixed the 2 unobtainable achievements.

Just to confirm, I have the exact same list as OP, and am also stuck at 96%.

The new update addresses some achievements but I'm not sure if will fix these 2, the update is out on steam and so far nobody unlocked yet.

Just to add my name to the list, have every enemy from the above, sat at 96%

ok so re-playing the final boss fight does not add Dakyne to the codex, did anyone try in co-op?

I am only missing 438 Hung from that list even though I definitely beat him, stuck at 93%. I got the counterhack achievement in that fight so I know I beat him, not sure if my ally bot getting the last shot caused the problem.

Like ComicKaze23, I’m also missing 438 Hung after finishing the game. The only weird thing about my fight with him is that I was concentrating on his two henchmen first and when I killed the henchmen the fight was over. I thought it was weird but shrugged it off.

Anybode know the locations for Combat Hacker
and Corporate Grab Teams?

438 Hung for me as well.

Hey, these two achievements are unlocked to 0.01% of players, how is that possible?

438 Hung missing for me too, even though I've 100% the game

Buenas para todos!! Yo los tengo todos y no me ha saltado el logro..... Saludos

Missing 438 hung too...

I was at 96% and my in game list matches what is written here. When I reset my game progress and played it over again I got no new codex entries of any kind.

I did note there is a named mob "Chunk" that can be found in "Chunk's Basement' in the middle of Black Lake Towers Zone. I have killed him a couple times on the latest patch and he is not added to the enemy list.

Also finishing the game again on the latest patch and it did not add 'Dakyne' to my list.

I'm stuck at 96%, my game codex matches the list of enemies in the guide.

I'd say we have another update coming in soon as this and Comprehensive are now showing 0.01% unlock through xbox dashboard (which would be from IRL testing)

Stuck at 85% with 438 Hung missing from the list. Certainly an error, as the Enemies list is for generic enemies, and he is already listed in the BIOS list.
Hope a fix is in the works, seeing the 0,01% stat.

Stuck %96

438 Hung and Celine is missing

I have all enemy codex entries, but no cheevo :(

@XPro PT when is that landing for Xbox?

Hi everyone, I am part of the "96% club" too, with all the entries matching the ones listed in the guide. :(

Interdimensional Calamity showed up in my list today and popped this chievo for me.

Flatliner unlocked for me today with the new addition to the Enemy Codex: Interdimensional Calamity.
Comprehensive achievement is still not unlocked after getting Flatliner. My codex matches the authors list, with the addition of Interdimensional Calamity.
*Note* I am playing on PC/Steam

@Kelkric @Arii Nice, and thanks for letting us know.

Both of you got this on the Steam version? And how did you get the last Enemy Codex entry?

All I did was load up my saved game and it automatically added the codex and unlocked the achievement. I assume, because of the specific enemy, that it will only add this enemy codex if you have completed the main story line.

Yes, this was on steam for me.

@Arii Thanks, that's good news. Let's hope the same can be done for the other Codex entries and Comprehensive, as well as for the other versions of the game.

@Arii That sounds like the name of the final boss to me. Can you read the bio to confirm this? I've completed the game so in theory, when this patch roles out to Xbox, at least this achievement should unlock.

The patch didn't fix it for me.

@Itarou You are only missing the entry that was supposedly added by today's patch? Did you play the game solo or co-op? Anything else that you can think of that could interfere with the achievement?

@F77Bloky I checked the list again and it seems I was also missing 438 Hung :(
I played all the game alone.

i also missing 438hung. now 96%

Achievement is fixed. Just update your game and load into your character, pops as soon as the game loads in (given you meet all the requirements)

Fixed with the patch for me

Patch didn't work for me either, still missing 438hung

Finally I get the achievement

I know decay will come in quickly but thats a tasty 13k to have for the time being :D

the achievement pops when you launch the game now having done everything in the campaign. The missing entry was "inderdimensional calamity" from the final mission.

I played couch coop with a friend, my main character joined his game. Now my main character is stuck in his game even when i load solo. My own game with all things done seem to be gone but my character is still maxed out. Anyone know if and how i can return to MY game?

Fixed for me this achievement with the update.

Works for me as well now. Popped up when I loaded in. I'm on a Series X.

+1 also works for me with the update, now the other 4 are missing hahahaha

The best the studio could do is launch an advanced game keeping the level + weapons + armor + money to be able to make the missing achievements

Fixed for me as well, thanks (XSX)

Hello, achievement passed thx (XsX)

Loaded in on PC and I'm still missing the interdimensional Calamity. Feelsbadman.

Hi ! Only missing entry is "Siege Mech". Any idea on how to get it plz ? Already finished every side mission :'(

Were do I find havoc plz

https://youtube.com/watch?v=bMklLyvj8oc&feature=share
1:20 The location of the mech

Just loaded up the game and got it as soon as I spawned!!

Got the Interdimensional Calamity entry, achievement hasn't popped and I still don't have 438 Hung's entry. Went back to the boss fight area hoping it would pop there but no luck. Back to the waiting line.

Still don’t have 438 Hung after the patch. This is ridiculous.

Celine is still missing from my list despite completing the corresponding mission and killing her. The patch didn't fix any of the glitched cheevos for me unfortunately. Disappointing...

I also don't have 438 Hung after the patch. I've 100% the game.

100% the game solo, and still missing 438 Hung. Can they either patch retroactively killed bosses (Like Calamity) or let us fight them again?

For all of you that are still missing enemy codex entries after the patch:

I hope that all missing entries can be added retroactively with a future patch in a similar manner, but obviously I don't know if and when this will be possible.

Because we still have to wait for the fix for Comprehensive, I would wait until at least that patch before starting a new playthrough just for this achievement. I didn't even expect that Flatliner would be fixed by this patch in the first place, as their Twitter account said the achievements would be fixed by the next one. So, maybe then all other missing Codex entries can be added. 🤞

For me the patch didn´t work. Still missing HAVOC entry, the boss from the Foreign Code mission... I guess I´ll have to wait for the next patch or join a coop that haven´t done this mission yet. Kinda sucks

I have every enemy listed here and still no achievement

Jack Burton81 Havoc can sometimes spawn at the end of the Scraplands, I think it's random though but you could try a few runs to the end of the area from the back

@packetloss X That's a common issue for Win10 games through GamePass or the Microsoft store. You can get the latest version by reinstalling the game. I just installed the game on my pc and it was version 2.1.4.0 for me.

On my system Windows 10 has just added the latest patch without uninstalling and reinstallnig the game - but it's 15.2GB anyway - might as well reinstall if you dont have the option to update it.

50g unlocked - i kept this game --- on... install just in case - cheers - just waiting on the codex my guy - hopefully i was thorough enough.. thought i was

Still need to find an ungrateful Merc, any ideas?

Anybody know where the scientist are? I cannot find them

Still missing 438 Hung. Poor update.

@WhyattThrash thanx I’m going to try it out!! ✌🏻✌🏻

EDIT: It worked!! Thank you very much!!

Just rolled credits, and am still missing Celine and Havoc. Celine is a boss from one of the main missions I have already completed, so no idea how I'll get this without a new playthrough.

Guys. If the game doesn't update, you just need to open the Microsoft store instead of the Xbox app and refresh all updates. Works without reinstalling it.

Came back to the game after a few weeks away to finish the last mission today and Celine is still missing from the enemy codex for me.

I started a new character after this last patch. I was able to get the complete all main missions and side quest achievements which were cursed with the glitched counters. However, I could not get the enemy codex achievement. The 348 Hung remains absent on my codex list. Can anyone confirm when & where the 348 is added to the list. Is it with the hammer guys throughout levels or with the boss on the 10th msn?

Just need a seige mech, any ideas? Everything says story mission but I have cleared story

Just need a seige mech, any ideas? Everything says story mission but I have cleared story

Ok, for some enemies mentioned.
438 Hung - Enemy codex added after late-game boss fight. Character entry added after talking to him in their HQ.
Scientists - In the morgue in Cluster 13
Siege mech - Can be found in lots of places; Corp zone and the Scrap lands among others

Thanks @WhyattThrash

Yup after checking I am on of those that just needs Celine too…
Not replaying this until a REAL fix comes out

Missing siege mech and can't seem to find any post game. Do they respawn anywhere at all?

I have Celine, Scientists, 438 Hung... but Siege mech don't want pop.
I just killed a second just now at silo 86, but he doesn't want to appear in the list. My Flatliner achev is block at 96 % =/
Just wait the next patch...

edit : I got it ! I played the game on the PC GamePass, uploaded the save, then ran into a Siege Mech in The Glut area, and it popped.
Reminds me of Forza 7 with achievments stuck on One X, but popping on the GamePass PC...

Even with the latest patch 3.0.6.0, still can't get this achievement. Still missing 438 Hung even though I've finished the game.

Still missing: Celine and Hung 438

So even though I Did be stupid and played co-op, I am actually only missing one enemy on this list. Can someone point me in the direction of a Black Hacker? There is ZERO information online as to their whereabouts. Thank you to anyone who can help me.

@OneBgBdArtemis You can check on the bridge between the Umbilical and corpZone. I know that there is a hacker there, but I'm not sure if it's a Black Hacker or a Combat Hacker (hard to see the difference tbh).

Another place you can try is the very end of the Silo 86 area in deepStink, near the entrance to MenShen.

Could you update me if you find one in either place or not? I am currently writing the walkthrough for this game and it would be nice to include alternative enemy locations.

It is impossible for me to make a new game +, when I create a new character and start a local coop session, when I start my main character is back in his world, I have been in his world for hours and nothing, any advice or guide, thank you very much.

I’m stuck at 96% and missing only 438 thug. Yeeee

@Fulled By Beer I'm in the same boat, all the enemies listed I have in my codex. Played on Series X not sure the verison number, I played it was a couple months ago. For the most part it was a solo run but I always booted up in the online mode.

Stuck at 96% and missing Celine...

update.... and stil stuck on 93% missing hung 438 and Celene

They fixed Comprehensive but not Flatliner...still missing 438 Hung.
It's funny because now I have Comprehensive unlocked and Flatliner still missing lol

What about a fresh run? Did someone tested that?

Ok thanks Bloky, I wasnt far in the game because i stopped playing when I heard about the glitched achievements so hopefully I wont encounter any glitches on a fresh run

Found the Siege Mech fast travelling to RezDev and going towards corpZone. I think it is a random spawn.

Just got Comprehensive but still don't have this one. Missing 438 Hung never played coop or did anything weird.

@SPARTAN3 That blows. Unfortunately, I don't have a fix for you or know what causes it in your particular case. I only know of the issues that result from playing the game in coop or switching between characters.

@funkyTii I haven't found a way to trigger this fight again. So, unfortunately, if you are missing either Celine, 438 Hung, or Interdimensional Calamity after their respective boss fight, this will mean you will have to replay the whole game as far as I know.

That is, unless the devs can fix it with a future patch.

Yeah, I thought so too. I mean it is a pretty game, but there is so much to play these days. At least I can boost a bit with a second seasoned character.

I already got this cheevo. I had to replay the game with my leveled up character. I had missed interdimensional calamity, so I had to replay the hole game again, but it was fast with the leveled up character. I focused only in the main missions

So a faster way to get this achievement if you have already completed the game before is use 2 controllers and with the high lvl character boost the second character until the end? at least in my case that the 438 Hung is missing on the list

@camege same here, but I'm still missing Interdimensional Calamity

Missing 438 Hung and Dozer. Another day, another incompetent developer.

Unfortunately, I'm starting to agree with you and regret my 5 star rating of this title I gave Before I got very far into it. Dissapointing.

Shouldn't be difficult, the issue is that is not a single enemy missing for everyone, I did all 100% of the game, explored everything and even the yellow upgrade items I got like 3-4 spare on the world that coulcn't pick up because I maxed everything before time, 438 Hung is a campaing unmissable enemy so if according to the savegame I have completed the game it's impossible that I missed that enemy, let's wait they already fixed one achievement

Technically the game is already fixed for new players as I understand, it's just us the ones that played the game day one or before these last patches that are affected, at least they gave a response that they'll work on it

Started to play the game for the first time after the latest patch, but like many other i am missing 438 Hung so it is still bugged.

F77Bloky: No idea why, played the whole game in single-player.

Even got the "comprehensive" achievement halfway trough the game so i was suprised that this bugged for me, lets hope future patches fix it.

@Borshajen That's too bad, but thanks for letting me know. I will try to keep this guide up-to-date when new patches roll out, so check back later to see if anything has changed.

Can also confirm that I have finished the game but am missing '438 Hung' in the enemies codex.
The fight did end when I killed both his guards though so maybe something to do with that?

Fresh run, all solo. Will wait for a fix.

For what it's worth, I made sure to kill hung first, the codex notification appeared on screen then I killed his hands and it counted for the achievement. Maybe try kill him first and if you don't get the codex popup let yourself be killed?

@ZackoBlacko @B0YD0 I tested this too, and I got the codex even when I killed the Hands first and then Hung. But then again, the fight didn't end after killing the hands for me. Must be a glitch or something.

I can confirm it is still glitched. Missing 438 hung.

Still bugged, completed first playthrough, got comprehensive half way, but flatliner 96%

my achievement is stuck at 96% i'm gonna start up new game and try to get the last enemy on my codex

Logged into the game for the first time since winning at launch and this immediately popped.

I can confirm this achievement is now fixed and unlocked as soon as I entered the game.

@TymanTheLong @Malboa77 That's great news! I assume you had a missing enemy codex entry previously? If so, is that one now included in your list or did it unlock without it?

Fixed! missing entry and achievement popped when entering the game.

I can also confirm it's fixed now. Upon loading up my character I got the codex entry about 438 Hung, cheevo popped soon after that.

@BRzLnWaRMAchiNe @JestemWojtek Thanks for the confirmations!

Can confirm, Flatliner just unlocked by loading my save game.

Can confirm, Flatliner just unlocked by loading my save game.

Yep, adding to the confirmations, mine popped as I loaded into my save file.

Can confirm as well, after loading my save file the achievement popped!

The missing entry for 438 Hung popped in my codex. I have every single one now. But the achievement is still locked….

Also missing the Nug Engineer, according to the solution the y are on hightierstreet however...
Went through every single location on Hightierstreet there wasn't a single nug engineer...just a few nug gadgeteers by thoms gate upwards to the cosmodrome..

So I went to the Warrens and visited "The Edge"...and guess what Nug Engineers were there...

just leaving the info if anyone else is missing these..

I am having trouble with Havoc Codex

@AntaraelDulacre Thanks, I will add the info to the guide.

@PheasantFlucker You should be able to find it in Scrapland. If it doesn't spawn for you, you can try to travel between areas or reload the game. Hopefully, that will help you to finally get it. Good luck!

Just finished this pile of crap and still not got this achievement I compared the list and I have every enemy codex but the tracker is stuck on 96%.

Dec 2022, missing Megarachnoid, returning to the location has 2 spiders rather than boss. Loading save doesn't fix.

@Silver2020Smurf Not in my experience, they are just the same as ordinary enemies but with a fancy name. I will update if I find anything though.

Try every exit on every map.....it's possible there is an exit we are all missing that the missions do not take you to. The missing enemies might be in there.

I am trying this by exploring all over again. I will keep you updated but it won't be quick as I have my kids the next few days and won't be able to game much.

Why am I not surprised it’s either glitched game with working achievements or glitched game with broken achievements. Why won’t the developers test the bloody game before release.

@Xpro PT @Goggs25 Thanks for the information. Hopefully the patch will fix at least some of the issues players have, while we wait for the patch that will fix the Codex achievements.

same i got the enemy codex achievement but didn't get the codex achievement my codex is on 86% just like the author.

@T1OOO It is the final boss codex. When you go to Bio it displays a 3D model of said boss as part of the codex entry.

@Itarou Thanks for the reply. Some other players have also additional missing codex entries, including 438 Hung (which should be unlocked after a boss fight). I don't know if these will be fixed (i.e. added retrospectively) in a later patch, or if it requires a new playthrough.
Nevertheless, I recommend waiting at least for the next patch, which may fix these missing entries as well as the ones for Comprehensive.

Win10 GamePass version is still at 2.0.5.0 for me. No option to update from microsoft.com website or from the Xbox PC app. (a manual uninstall and fresh download/install of the entire game via Xbox PC app installed the current version 2.1.4.0. What a pain..... thanks @F77Bloky for the idea)

On my Xbox I logged in resumed saved game and the achievement popped and the new codex entry (Interdimensional Calamity*) was added successfully.

@Demon Slayer050 Hmm, that sucks. I am fairly certain 438 Hung is added after the boss fight in the main story.

Anyway, thanks for letting us know that the achievement is still buggy, even with a new character after the latest patch. I have no idea what's causing these issues for so many players. I just hope that with the next patch it's finally fixed for everyone. In the meantime, I flagged the achievement as buggy.

@Fuelled by Beer I haven't heard that one before, so I don't know how what to do. You could file this bug and hope the devs will fix it.
BTW, was this a solo playthrough, and which version(s) (i.e. patch) did you play?

@Mac Chickgun I have done several playthroughs, but not on the latest version. However, I never encountered these issues myself. Each time, I got all codex entries. I do recommend playing solo and not coop, as most of the issues for this game appear when playing coop or swapping characters.

If this is your last achievement, you could speedrun through the main story on easy and do only the side missions with unique enemies (I think only the Scientists in the side mission Bubble Trouble but I am not 100% sure). Though this is not ideal, it should be a lot faster than your first full playthrough at least.

This is how to run a new character through with your high level character: Start a new game with a new character, save & exit. Go to Couch Coop, pick your new lvl 1 character, sign in a guest acct and assign your high lvl character to the guest. DO NOT SELECT NEW GAME - THIS WILL RESET YOUR CHARACTER TO LVL 1. Instead, select Continue Game.

The downside to this is that both characters are on the same screen and one cannot run forward without the other following. It takes 2 people or you could play single player and go to coop couch each time you get in a pinch to bring in the big guns.

NOT fixed for me... upon entering the game my character is reset to level one as if it was a new game but my codex is filled as if it was kinda of new game plus without any of the pluses, the Comprehensive achievement poped but I didn't get this one... still missing two enemies on my Codex Entries... 438 Hung and Interdimensional Calamity... if I have to play the whole game again for these stupid entries I won't ever touch a game by this dev.

@ThisIsPrfct That blows! There are ways to reset your progress (i.e. story, not level) but not like that. Unfortunately, I don't think there will be a way to get your progress back, but you could try to contact the devs.

@xxDAMRONxx Strange that the achievement didn't unlock. I don't know if you tried this already or if it will work, but you can try to fix it by switching between characters (make a new one if necessary) and loading up your save again after switching back to your main character. 🤞