If you are new to this game, I suggest you stop here and at least play the game a bit.
I got half of the achievements naturally, left the game alone for years and wanted to complete all achievements only to find out some are just bugged.
Depending on how much editing you will do this can ruin the game experience because you can make yourself basically invincible.

This guide is going to show you how to edit certain game files.
I recommend you make backups of game files you want to edit before following this guide.
If you make typo's in any of the files the game will not properly end at the end of an act/mission and you will have to force quit and reload a save after fixing the mistake.
Some edits might also cause the game to crash on start.
Verifying game files can solve that issue and should restore correct versions.

Achievement results are calculated only when a mission ends, meaning you can save right before the final fight, get achievements and reload that save to try and get more.

The tutorial does not work for achievements.
The easiest way to use this guide is to play empire campaign and get the achievements in act 1

Most edits will work with existing saves, some might only work when starting a new campaign.

Sources for this guide:
List of achievements with requirements
Config edits for some of the achievements

If you plan on unlocking the achievements in Empire Act I, you might want to know when the mission will end to time your final save.


Progress as you wish through the map, explore everything.
You will be pointed towards certain locations for the mission.
Clear the entire far end of the map.
You will get a new person in your party: a female healer called Inoel.
She will join your party even if you have no room in your party.
She wants you to bring her to the capital.

When you return to the capital the end boss spawns near the gate and cannot be avoided.
Here is a screenshot.


After the boss fight there is some dialogue and the mission ends.

When the mission is over, you will get a victory screen that shows the stats only for the achievements you unlocked (and not much else)

Gather and/or spend the following amounts of resources


Either earn it naturally by just ending turns on a map where you have all resource types captured. Will take awhile and you need to be in a mission that has buildings of all types (act 1 empire does not have earth mana and fire mana producers)

Or edit the game config town_empire
found in \Steam\steamapps\common\Disciples 3\Resources\Profiles\scripts

Near the top of the file, you will find the default values for income:
(for elves this is earth, for legions this is fire)

increase the amounts and add all types


This should work on existing saves when you continue a game after editing.
You could also edit the achievement file to reduce the values, but since we need resources anyway for some of the other achievements this is a better approach.

These can all be earned by just playing long enough

Or edit the relevant game achievement config
found in \Steam\steamapps\common\Disciples 3\Resources\Profiles\\achievements

The requirements for all 3 levels are listed here.
example file potion_use

Explanation on some of the values
- Type could also be percentage but don't change this value for these achievements.
- Achievement default values (in this example):

To make the achievement easier to get, lower the values of the 3 levels.
Don't use the same value 3 times as that will not work.
Also recommend to make it so that the gold value is highest and bronze the lowest.
Percentage (like in fog_of_war) just takes numbers, no % symbol.


This works on existing saves.
Finish the mission, check what you unlocked.
I recommend to close the game before editing config files and then reopening.
Edit the config files above where needed and try again.

note: I kept the files that helped me unlock the achievements. I will copy & paste the entire contents of those files here. Usually only the values change, sometimes the type also changes.


You would think completing a whole map undefeated would trigger the achievement. It does't seem to do that. Instead you actually have to lose some battles for it to even start counting.
Lose some battles on purpose (the more the better if editing like below). Send some hired leaders into a dungeon alone and quick battle to get it over with.

Edit file defeats
found in \Steam\steamapps\common\Disciples 3\Resources\Profiles\\achievements


Changes compared to original file:
- Changed type to range
- Lowered values of bronze and silver.
I got all 3 with a 10% lose ratio

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Counter seems broken, some report only having 5 when completing a large map.

Edit file long_way to:

Changes compared to original file:
- Lowered values of bronze, silver and gold.
Should work if you walked around the entire ACT 1 map.
I made Lambert run laps sometimes because I thought it might help.

---

Some parts of the map are not conquerable, making it very hard to reach the 90%.

Edit file territory to:

Changes compared to original file:
- Lowered values of bronze, silver and gold.
Should be fine for ACT 1. Can be lowered more if you are skipping parts of the map.

---

You can only build 16 structures or so in the Capital at later acts. This seems to only count for 9%.
Unsure of how to trigger normally

Edit file buildings to:

Changes compared to original file:
- Changed achievement "buildings" to achievement "building"
- Changed type to range
- Lowered values of bronze, silver and gold.

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This is a weird one. Nobody seems to know what this achievement needs.
From the description it sounds like maybe the amount of times you loaded a save (perhaps while losing during a battle). Or maybe this only counts on specific bosses (perhaps the final boss of the game). Maybe it only counts loading only the "battle save" that the game creates automatically, but only in special cases? (near death?).

Edit file game_loads to:

Changes compared to original file:
- Lowered values of bronze, silver and gold.
I used negatives as values and that worked.
Since there is no clear way to even get 1, this seemed worth a try.
Sidenote: I first tried it with all values 0. Only bronze got unlocked. Then I used negative values and the other 2 unlocked.

---

Does not seem to trigger naturally. I played multiple acts with the map fully cleared and not even the bronze achievement popped. I unlocked these 3 only after editing the file.


Edit file unit_kill to:

Changes compared to original file:
- Lowered values of bronze, silver and gold.
- Changed type to range
I used negatives as values here aswell because why not.
If you cleared the map, this should just work.

As mentioned, some of the solutions in this guide were found by other members of the community.
I made this guide so others don't have to dig through old discussion threads to find the solution to these buggy or just plain broken achievements.


p.s.: This is my first guide I ever wrote so apologies if the layout is kinda meh.