Unfortunately, by the time I'm writing this, some of the achievements for Organ Trail are broken, and some are seemingly broken. Some achievement guides are out-dated, so I thought I should write down what I did to 100% complete this game, in August 2020.

For achievements with counters, the next section deals with a workaround by replacing a .dll file. Rest of this guide assumes you have fixed the counter problem, either by my method or any other means.

Below is the list of all 28 achievements, classified by their unlock condition. Some are trivial, some have more detailed explanation in the latter part of this guide.

When you beat the game, or in other words, when you make it to the safe haven,

• The counter for "Marathon" increases by 1.
  
• If the difficulty is Difficult or Suicide, "True Survivor" unlocks.
  
• If any of the alive member has word "romero" in his/her name, "I Know A Guy" unlocks.
  
• If you are the only member, "There Can Only Be One" unlocks.
  
• If you are the only member and if you killed four other members when they are healthy, "The Loner" unlocks. More details in its own section.
  
• If you haven't traded during the run, "Trader Jose's" unlocks.
  
• If you have started the run with 0 money, "Penniless" unlocks.
  
• If you have started the run with 0 food, "Scavenger Pro" unlocks.

Below are the others.

• When you die, if you are infected, "Life On The Other Side" unlocks.
  
  
• When you choose to ford (break out guns or sneak) through the zombie horde, and succeed, the counter for "Fording Master" increases by 1.
  
• When you choose to break out guns through a horde, if it's your 4th time doing it in that run, "Take No Prisoners" unlocks.
  
  
• When you kill a zombie, the counter for "Zombicide" increases.
  
• When you kill a zombie, the counter for "Silver Bullet" increases. When you miss a shot, the counter resets to 0.
  
  
• When you decided to kill a party member but wait and click "I Can't Do It" button, "I Can't Do It" unlocks.
  
• When you kill a party member, if the member is infected and incapped, "Make The Call" unlocks.
  
• When you kill a party member, if his/her name is "Ryan" and if you have travelled less than 230 miles, "Night of the Living Dev" unlocks.
  
• When you kill a party member who is healthy and not infected, the counter for "The Loner" increases.
  
  
• When a party member dies, if he/she is sick from dysentry, "Don, Bill & Paul's Curse" unlocks.
  
  
• When you use a medkit, the counter for "Pills Here!" increases.
  
  
• When your scavenge ends, if you have collected equal or more food than your carrying capacity (250 by default), "Overstocked" unlocks.
  
• When your scavenge ends by being attacked by a zombie, the counter for "Zombie Chew Toy" increases.
  
  
• When you gain money, if your money is equal or more than 1000, "Fat Cat" unlocks.
  
• After you get a car upgrade, if all five slots of the car has an upgrade, "Pimp Your Ride" unlocks.
  
  
• When your car breakdown, the counter for "This Car's A Lemon" increases.
  
  
• When you stop at a point of interest, the counter for "Sleuth" increases.
  
• When you stop at a tombstone, the counter for "Grave Robber" increases.
  
• When you stop at a tombstone, if the tombstone is yours (from your prior run), "Deja Vu" unlocks.
  
  
• When you survive a boss fight, if it's your 4th (not 3rd) distinct boss type you have survived, "Big Boss" unlocks.
  
  
• When a missing event occurs (wandered off, take a piss and never return, ...), if the member's name is Chuck Norris, an alternate event occurs, and "[Secret]" unlocks.

So that's it, all 28 achievements. However some achievements need more explanation, and above all, the counter achievements should be fixed. The next section is about the fix.

Let's start with fixing the broken achievements.

Below achievements

• Grave Robber - 50 tombstones
  
• Zombicide - 500 zombie kills
  
• This Car's A Lemon - 4 wagon breakdowns
  
• Sleuth - 30 points of interest
  
• Pills Here! - 50 medkits
  
• Silver Bullet - 25 zombie kills without missing a shot
  
• Zombie Chew Toy - Get attacked by zombies 20 times during scavenging
  
• Fording Master - Successfully forde a horde of zombies 3 times
  
• Marathon - Beat the game (make it to the safe haven) 5 times

have broken/stuck progress counters, which does not go up whatever you do. However, in fact the game is doing its best to keep track of your progress, and it is possible to unlock those achievements legitimately.

Below is the short summary of what's happening to these achievements.

1. The game keeps track of counters for achievements - visited tombstones, used medkits, etc.
   
2. However, the game never updates/uploads the achivement progresses to Steam. Thus the counters are (seemingly) stuck in Steam's "View My Achievements".
   
3. Nevertheless, the game tries to download the progress from Steam. It happens when the main menu loads (right after hat & skull splash screens).
   
4. Therefore, loading main menu effectively resets all achievement progress counters.

For a more detailed explanation, read this great guide.

Forcing the game to upload achievement progresses to Steam should be the best and proper way. It seems watching the credit did the job in the past, but it does not work now. I think the current version does not upload the counters no matter what.

So, some other guides and discussion threads focus on the other half: forcing game to NOT download the progresses from Steam. Meeting the goals in one single run is a sure-fire method, by avoiding the main menu. Actually you would be able to achieve most of the above achievement that way. Or a method from the aformentioned guide disconnects Steam client and the game from the Internet, preventing the download. However, for me it felt cumbersome.

So I thought I could just modify the game code to not download the Steam version of the counters. A simple modification to a .dll file (CSteamworks.dll) was sufficient.

If you want to download the modded version, here it is:

1. Download this modded CSteamworks.dll: LINK[www.dropbox.com]
   
2. Replace CSteamworks.dll in (game directory)\OrganTrail_Data\Plugins\ with the newly downloaded one. Probably the directory will be C:\Program Files (x86)\Steam\steamapps\common\OrganTrailDC\OrganTrail_Data\Plugins

That's it. Loading the main menu will not reset the achievement progress any longer. The problem is still the Steam counter is broken, so we have no proper indication that it is working. So before starting the Marathon, check it with easier achievements, like This Car's A Lemon. Just break your car two times, go to main menu (by whatever means), break the car two more times. See if the achievement pops.

In short, the modded version of CSteamworks.dll always fails (return 0) in downloading progress from Steam, so the game naturally use offline version of the achievement progress.

+ EDIT : Below is the exact change to the file, which is 5 bytes long, from 0x50C1 to 0x50C5. HxD is a great tool, anyway.

The rest of this guide is about some intricate achievements.

This achievement use a counter, so you should read prior section "Workaround for Broken Counters" if you haven't already.

You should kill 25 zombies without missing a shot.

Everytime you kill a zombie, the counter for "Silver Bullet" increases by 1 (a separate counter for "Zombiecide" also increases). When you exit the game after reaching 25, the achievement unlocks, and the counter is stuck at 25, forever.

The counter resets to 0 when you miss a shot, not hitting a zombie. Sensibly, the counter does not reset once after reaching 25 even if you miss a shot.

Killing a zombie is different from hitting a zombie, as the zombie dog bosses requires multiple shots to kill. However it really shouldn't matter as killing 25 zombies is trivial. Just be careful not to miss.

Despite the description (Kill all the other members of your party while they are healthy), the achievement does not unlock when do exactly what it says. In reality, you should do what the description says, and make it to the safe haven in that run.

When you kill a party member, if the member is healthy and not infected, game's internal counter goes up by 1. So after you kill four members who are healthy and not infected, the counter is 4. Reaching 4 does not unlock the achivement right away, however the counter is read only when you beat the game (enter the safe haven). At that point, if you are the only survivor of the your party and if the counter is 4, the achievement unlocks.

There are 4 possible health state for members: healthy (green), sick (red), incapped, and gone. I think the HP itself does not affect the achievement, as long as the member is healthy with green HP bar. However you can just kill them at the start of the run, so why wait?

Resonably the "There Can Be Only One" achievement should unlock whenever "The Loner" unlocks, but there seems to be some contrasting reports. If that's the case, just do a one more run.

When you die during a run, your tombstone is made at that location. I think the game keeps only the latest one. When you go past that point in your next run, if you're lucky, you'll be prompted about a familiar looking tombstone. Stop at there, and the achievement should unlock.

I think this achievement doesn't work in Endless mode, so start campaign mode and die very fast. Just drive past that point in the next run.

Three achievements require you to assign a specific name to yourself or a party member. They are "I Know A Guy", "Night of the Living Dev", and "[Secret]".

For all three achievements, the name is case-insensitive.

For "I Know A Guy", the name must contain romero (case-insensitive). Bring one (or more) member whose name contains romero to the safe haven, and the achievement should pop. In theory naming the player character romero should work too, but I'm not so sure about this.

For "Night of the Living Dev", before you travel 230 miles, kill a member named ryan. Again, case-insensitive.

For "[Secret]", the name should be chuck norris, case-insensitive. When you encounter an event on the road in which a party member went missing, if the member's name is that, instead of the original event, a much longer event is prompted, in which [Secret] sacrifices himself for the greater good. The event happens not so frequently, so name all your party members as the name and play for a while.

"Big Boss" is one of the reason I decided to write a guide, as many guides are out-dated. With final cut expansion, you have to survive 4 distinct boss fights, not 3.

The three original bosses are:

• Bear - random encounter during scavenge
  
• Dog - random encounter during scavenge
  
• Deer - random encounter on the road

Three additional bosses from the final cut expansion:

• Octopus - encounter after you enter the safe haven
  
• Bandit - encounter around the end if you have traded a party member, or he/she went missing
  
• UFO - random encounter during scavenging in Area 51, with The Survivor character

You have to survive at least 4 different kind of boss fights during one run. Remember that you have to survive the boss fights.

For the bear and dog bossese, just do many scavengings. The bear is (reportedly) unkillable, but shooting it will make it slow enough. The dog dies with three shots, not a tough enemy.

The deer bosses seems random, and I think you can make it to the safe haven without encountering them.

The octopus boss appears when you enter the safe haven, after you start the generator. Beat it and it will count to the "Big Boss" achievement. The problem is the boss does not appear on Easy difficulty. So make sure you play on at least Normal when you aim for the "Big Boss".

The bandit boss appears when you depart the final town, heading to the safe haven. It only happens when you have traded a party member to a bandit gang, or if a party member went missing before.

The UFO is more intricate, and I myself haven't encountered it, but here is what the discussions forum says. Start the run with The Survivor skin, go to Area 51, do some scavengine until UFOs appear.

In summary, complete a run in Normal or higher difficulty and be sure to encounter the Bear, the Dog, and the Deer, since the Bandit is conditional, and the UFO appears only when you aim for it. Again, remember that you have to survive the boss fights.

Description for "Take No Prisoners" says "Always choose to shoot your way through zombie hoardes." However it seems you don't have to do that, and doing that isn't enough to unlock the ahievement either.

What you really have to do is choosing "Break out guns and clear a path", four times in a run (or at least that's what the code says). I think this achievement should also work in Endless mode.

That's it for this guide. If some part of this guide is misleading, or amiguous, or if you need more detailed guide on other achievements, just let me know. I'll try my best.