I strongly recommend saving the game regularly to different game states. Firstly, there are decisions you have to make, which can result in missed achievements, as there are different achievements for different decisions and secondly, the game tends to be buggy here and there, which sometimes resulted in me having to start from scratch after a few hours of game progress.
In hindsight, it could even be that this bug was triggered when I started the game. In my savegame, it was possible to start the start sequence (letter from Haller) several times if you went back to the beginning. Afterwards, all tutorial instructions, such as "Press F to look around" or "Press E to take a closer look", were missing. After I restarted, I was very careful not to start any cutscenes more than once to avoid bugs.

The background colors behind the achievement icons provide a rough indication of the type of achievement involved.
Red backgrounds usually mark the completion of certain quests.
Green backgrounds indicate certain actions in the game.
Blue backgrounds follow the main quest.

All green achievements can generally be missed, as they are side quests that do not need to be completed in order to finish the game.

"Man hilft, wo man kann! Du hast dem Jungen bei der Pilzsuche geholfen"
"You help where you can! You helped the boy look for mushrooms."
This Achievement is easy. The very first person you are likely to meet is a boy who gives you the task of bringing him mushrooms during your first conversation. It doesn't seem to matter what answer you gave him beforehand. He instructs you to bring him 10 porcini mushrooms. He is located along the path on the left-hand side before the guards. Pick 10 porcini mushrooms and bring them to him.

"Erstmal einen bauen! Crafte die Puppe"
"First of all, build one! Craft the doll"
You will unlock this in the course of the main story after you have collected sticks for the boy. As a thank you, you will receive a recipe for making the doll. Go to the workbench, make the doll and the achievement will be unlocked.

You should save here the first time so that the game can be reloaded afterwards to avoid missing any achievements.

"Verräterischer Hund! Du hast den Jungen bei den Wachen verraten"
"Traitorous dog! You betrayed the boy to the guards"
Again: You should save before this! In the dialog there is the possibility to betray the boy. The conversation then ends immediately and you can go into town. You also get this achievement. I assume that (if you don't load and continue playing with this decision) it won't be possible to make the boy your friend later on.

"Hört! Hört! Erster Battledialog gewonnen"
"Listen! Listen! Won the first dialog"
This achievement is also unlocked in the course of the main story. Sometimes there are "battle dialogs" in which a display shows the progress of the dialog. If the pointer is on the right-hand side after the dialog (i.e. over halfway through), you have won the dialog. I got this achievement directly in the conversation with the guards after building the doll. I used as much information as I could (for example the description) and didn't give the boy away. If you are at the mill beforehand and collect the sticks, you can also examine a small sack. You will find a note from the gang, which will also provide you with information for the conversation.

"Eigentlich wollte ich doch nur noch schlafen! Du hast den Weg in den Ort frei gemacht."
"Actually, I just wanted to sleep! You cleared the way into the village."
This achievement is also unlocked with the main story as soon as you clear the barrel behind the guards.

"Kegelbruder. Räume beim Kegeln ab"
"Bowling brother. Clear the bowling"
I unlocked this achievement after winning against Hansgirgl at skittles. After the first night in the inn, simply follow the path to the mayor that Kathi explains to you. Walked past him as soon as the mayor-cutscene ends and towards the boy from the beginning and Hansgrigl. If you talk to Hansgirgl, he gives you the order to have the miller make skittles. That's what I did. Watch out, you have to roll the dice for charisma or empathy at the miller. He makes the cones. You can take them straight away on the condition that you beat Hansgirgl at skittles. After I had knocked over all the skittles, the achievement was unlocked.

"Do legst di nieda. Werde ausgeknockt."
"You'll lie down. Get knocked out."
I got this achievement when the game still had a bug regarding bowling, which accidentally unlocked this achievement.
Therefore, I can only assume that you simply have to be knocked out by one of the guards to get this achievement. There are always guards patrolling the town at night and you can be knocked out by them.

"Auf die Freundschaft! Der Junge nennt dich seinen Freund"
"To friendship! The boy calls you his friend"
To unlock this achievement, you have to put together a fishing rod for the boy after you have already helped him with the mushrooms. Talk to him after you have slept in the inn for a night and he will tell you about the angler, fish and worm. The answer you give him doesn't matter, I guess. I have chosen "worm". He then asks you to make a fishing rod out of string, a stick and a can. To do this, you must have all the ingredients in your inventory. The can is the hardest to find. I looted crates for it. The crate in which I found the can was under a canopy near the crime scene, where the old lady's house is. The box in question is next to the neighbor's house. Don't forget that you have to learn the recipe for the special fishing rod before you can craft it. After the conversation with the boy and after you have collected all the ingredients, it should be in your inventory as a recipe that you can then learn. After that, all you have to do is make the fishing rod at the workbench and then deliver it to the boy. When he asks if you would call him a friend, say "yes".

"Knacks - sowas macht man nicht! Der Leiche die Hand gebrochen!"
"Knacks - you don't do that! Broke the corpse's hand!"
Ideally, save the game before you speak to Lenz's father on his farm for the first time or directly afterwards before you examine the corpse. There is an option to examine the corpse's hand more closely. To do this, you have to use physis. You only get the achievement if you fail the roll.

"Oh, komme ich ungelegen?! Finde die Räuber"
"Oh, have I come at a bad time?! Find the robbers"
To unlock this achievement, all you need to do is discover the location of the bandit camp (You can also take a look at the map below). So you don't necessarily have to sneak or eliminate or knock out enemies. All you need to do is run through the camp once and leave again. The easiest way to find the camp is to go to the woodcutters first. Just a few meters from there in the direction of Schormayer Hof is a large bush on the right. Run through it and follow the path. (All of this is also a quest that you can get from the woodcutters if you ask them for the schnapps. Be careful, you should save beforehand, because you can also lose the toss)
You reach a small bandit camp, which is not yet the camp we want to go to. Turn right at the crossroads behind the camp. Follow the path up to the distillery. From here, the path becomes foggy. Follow the path further up. Watch out for the guards here, but the large camp is just behind them.

"Der Wanderer. Erreiche alle Orte auf der Karte"
"The Wanderer. Reach all locations on the map"
All you have to do is reach all the locations marked on the following graphic to the right of the map.

"Liebe! Erreiche das Liebesnest"
"Love! Reach the love nest"
All you have to do is reach the location that I will explain below. You start in the large bandit camp, which is also marked on the map above.
Then walk along the path shown in this screenshot. It is a path that you can easily follow. At the end of the path you will find the location. Watch out for a guard here too.

"Füreinander da sein! Höre dir Apollonias Geschichte an"
"Be there for each other! Listen to Apollonia's story"
After you have reconstructed the night with Schorsch, this quest will start. First you will have to mediate between Apollonia and Schorsch. Then you will take care of Apollonia's business. I wasn't able to go to the doctor with this, so I spoke to Resi at Resi's cottage and let her help me. I don't think it's possible to get the doctor to help. But I could be wrong. After handing in the herbs to Resi, you tell Apollonia for the last time and get the achievement when you complete the quest.

"Bayern, des samma mia! Trinke 7 Bier direkt hintereinander"
"Bavaria, that's us! Drink 7 beers in a row"
Pretty simple. Just drink all 7 beers in your inventory one after the other. If you don't have enough beer, you can buy some from Kathi.

"Bierkönig. Trinke 50 Bier"
"Beer King. Drink 50 beers"
Also quite simple, but expensive. Simply save once beforehand, then sell enough stuff from your inventory to Kathi and buy up her entire beer supply. In my case, she had 40 beers in her inventory, which weren't enough. I then slept one night and bought another 10 beers from her the next day and drank them. However, it will make your life a lot easier if you stand directly in front of the door of the pub after the first 40 beers, because after 40 beers the door is very, very difficult to reach.

"Unangenehme Prognose! Du stinkst!"
"Unpleasant forecast! You stink!"
Once you have gathered enough information to confront Schorsch, you can start a dialog battle against him. At the end, you reconstruct the previous night. While you drunkenly follow the beer bottles, you will be guided behind the pub. Right there on the wall of the shed you can look around by pressing "F". You will notice a piece of grass, which you can examine more closely by pressing "E". You roll the dice for Perception and then Dexterity. At the end, you dig in the ground. As far as I know, it is important to have passed the skill roll first so that you know that it is urine. Then you roll on physis. It shouldn't matter whether you manage the roll or not. You stink of urine and get an achievement for it.

"Bei Gott 3 Kreuze! Schließe die Quest 'Die Wege des Herrn' ab"
"By God 3 crosses! Complete the quest 'The Ways of the Lord'"
This achievement should be unlocked automatically during the investigation, as it is part of the main quest.

"Beim nächsten Mal gibt's Wasser. Schließe die Quest 'Die Wahrheit im Hopfen' ab"
"Next time you'll get water. Complete the quest 'The truth in the hops'"
This quest is also part of the main quest and should be completed as the story progresses.

"Immerhin hat er gesprochen! Schließe die Quest 'Der Herr des Hofes' ab"
"At least he spoke! Complete the quest 'The Lord of the Court'"
This quest is also part of the main story and should be unlocked by progressing through the game.

"Der Watschnbam is umgfoin! Knipsse 10 Lamperl aus!"
"Turn off 10 lamps (aka. knock out 10 people)!"
Self-explanatory. Knock out 10 guards. You can do this by approaching from behind and pressing "E". There are guards at the bandit camps and the village is also patrolled by guards at night.

The next two achievements are closely related.

"Unvergessliche Gefallen. Befreie den preussischen Herren aus seiner misslichen Lage"
"Unforgettable favors. Free the Prussian gentleman from his predicament"
You will find the gentleman in the toilet directly in front of the Pfistnerhof. He prefers bossy answers and will give you the quest to get him a premium shoe care set. He will give you the recipe, which should be in your inventory when you leave the conversation. Then learn the recipe (1x Simple Shoe Care Set, 2x Linen Fabric, 1x Lubricating Oil, 1x Brush), craft it and bring it to him.
Then you have to bring him something to eat. He will also give you the recipe (1x pretzel, 1x radish, 2x ham, 4x beer) You can find the ham in the robbers' camps, both in the large and the small one. I got ham from a crate in the small robber camp.
Back to the toilet. Finally, you have to make a lock pick. He will also give you the recipe for this. (1x hammer, 1x iron wire, 1x lubricating oil, 1x brush). Save here!!! To free him afterwards and get the achievement, you have to roll the dice.

"Du hast einen Vogel. Vertreibe die Fliege mit einem Rabenschrei"
"You're off your head! Drive the fly away with a raven's cry"
While you are talking to the man from the toilet, you can drive away a fly in various ways. You must choose the second answer (give the fly the illusion of being a predatory bird with a raven's cry). To do this, you must use the throw on your gut feeling. If you are successful, you will unlock the achievement.


"Blumenliebe! Erhalte den Talisman"
"Flower love! Receive the talisman"
This achievement is also obtained in the course of the main story. I had the quest to find out from Kathi how to stop the quarrel in the village. She then asks who we think is suspicious. I used the information and asked about the Schormayerhof. Kathi gives us some schnapps and says we should talk to Lenz's father. After a brief conversation, we are told to go to Resi and the priest. I went to Resi first. She gives you a talisman and then you receive the achievement.

"Das letzte Klingeln"
"The last ring"
Unfortunately, I don't know exactly how the game handles the passing of time internally. I've certainly slept about 6 nights up to this point, but I think it's based on the progress of the main quest. After Kathi questioned me (compare achievement Blumenliebe/ Flower love) about the suspects and I helped Schormayer, I found the hanged doll in the shed. The next day, the situation in the village escalated. The two camps are facing each other in front of the school and it's your job to de-escalate the situation. If you successfully de-escalate the mayor and then do NOT pass the de-escalation with the teacher, you get this achievement.

"Der Weg zu deinem Herzen. Überzeuge Schormayer"
"The way to your heart. Convince Schormayer"
This achievement also follows the events. After witnessing the great escalation of the camps in front of the school, you make your way to the Schormayerhof. Here we eavesdrop and then talk to Lenz's father. If you win this dialog battle, you will receive the achievement.

General information:
Don't forget that there is plenty of food, drink and tinctures that temporarily increase skill points. If there's a good time to do this, it's now.
The murderer reacts positively to bizarre answers.
The mayor reacts positively to bossy answers.

"Geflohen"
"Escaped"
This is one of the endings you can get. To be honest, as much as possible has to go wrong. The important thing is not to be able to convince the murderer to turn himself in and not to do anything about it on your own behalf. This means that all your own efforts to stop him in his deed must fail and the conviction must also fail.
I have also successfully tripped Alois up.

"Gefasst"
"Captured"
I highly recommend consuming all the food with perks before the final scene in the church, because not only are there a lot of tosses, but there are also some very nasty ones.
I didn't trip Alois up. I picked up the gun, I was able to convince the murderer and then the boy by reminding him that I was his friend. I don't know if it's possible to get this ending without having made friends with the boy first, as it seems to be a very important argument in the dispute resolution at the end.

"Getötet"
"Killed"
I didn't trip Alois up, I didn't manage to convince the murderer, but I did manage to draw the gun I'd picked up earlier. However, I didn't manage my second skill roll (firing the gun).

"Feierabend! Beende das Spiel"
"Call it a day! Finish the game"
To do this, simply end the game with one of the different endings.

"Danke für die Unterstützung! Schau dir die Credits bis zum Ende an"
"Thanks for the support! Check out the credits to the end"
Do as they say. Watch them.