For each achievement I'll be listing what chapter of the game you can get it in. That way if you need to go through and just clean up a few then it's an easy process. Plus it just helps as you're going through the game since things can change pretty drastically between each chapter...
Developer
Moving on to some of the more random achievements we have Developer for opening the developer console while in the game. Now you may be able to just hit the tilde, or grave, key and have this open up for you by default. Other wise you need to do some set up outside of the game.
Basically they have a "LaunchOptions.dat" file that you need to edit with a text editor and change "ConsoleEnabled = false" to "true".
The easy way to get to this is by right clicking the game in steam, go to manage, browse local files, and then right click the "LaunchOptions.dat" file and edit in notepad or whatever text editor you use. Then make that console enabled change, save, run the game and hit the tilde or grave key to start cheating!
Cheater
Speaking of cheating.... The Cheater achievement is for unlocking the cargo door in chapter 2 without actually going and retrieving the code-scanner. Pretty self explanatory, but yea just go to the cargo door and put in the code 4517 prior to going and picking up the code scanner.
Yimpy
Then Yimpy will be for staring at Yimpy. This is going to be during chapter 4 after you talk to Anya and head off to find Jimmy and Swansea. Before you go do that, you'll look at the bulletin board in the med bay and see a sticky note with a weird looking face drawn. Just stare at that guy for 10 seconds or so and then you'll get that achievement.
Friendly Introduction
Next will be Friendly Introduction for find Curly during a weird little dream sequence type thing. The second portion of chapter 4 will have you in a dark area walking towards an old TV. Keep going past the TV and walk along the storage shelves until you find a large Curly staring back at you through the gaps. You can't miss him.
Wasteful
Wasteful will be for making the mock-tail before the cake during the birthday party in chapter 7. You'll first have to get water and tonic and mix those two. That'll be using codes 3142 for water, and 1324 for tonic. Once those are mixed you'll need to mix in some sweetener using code 2341. With all of that mixed you'll have the mock-ta using code 2341. With all of that mixed you'll have the mock-tail and get the achievement.
Any % Glitched
Now for one of the harder achievements in the game... Any % Glitched is for taking the mouthwash from Polle within 35 seconds of starting chapter 14. Now this requires using the console to enable cheats and is kind of inconsistent on if it's going to unlock or not. There were plenty of runs of me doing it in under 35 seconds, it not unlocking, and then eventually I said okay I'll come back to it later. Well then while I was playing through other chapters it just unlocked randomly. So even if it doesn't immediately unlock. Exiting the game and opening it back up seems to refresh it or something as well so you may want to do that after what should be a successful run.
The process to unlock this is going to be first going to the main menu. Hit tilde or grave and enable cheats. Then go to chapter 13 and not 14 because you can squeeze out a little extra time this way.
Once in 13 you'll hit the N key to skip the chapter while also holding P to skip through the dialogue in chapter 14. Once you're with Daisuke and you're out of dialogue then you hit right click to exit the conversation, look down, hit tab to open the inventory, turn on the code scanner, get out of the inventory, and hit O to turn on no clip.
Then you'll go through the floor, hit O again to fall while holding shift to drop quicker. You'll hit some stairs and have a message come up. Hit O to turn no clip back on, move to the left slightly, hit O to turn no clip back off and fall while holding shift again to fall faster.
Then once you have a message pop up again and are on the ground you'll hit O to turn no clip back on, and hold shift while moving forward and go straight.
Eventually you'll reach Polle and can take the mouthwash. If you do this quick enough the achievement should unlock, but if it doesn't you may just need to exit the game and open it back up.
Check out my video guide if you need a better idea of how to do this.
Trickshot
Trickshot is going to be during the weird like dream sequence chapters later on when you're in the graveyard with Swansea. Basically you need to spin around 360 degrees and shoot Swansea. Almost a 360 no-scope, but you do have to aim down sites to fire in this game. The way I did this was I went into a corner so there were only two paths for Swansea to come from. Look down one lane a bit longer to try to force him to come from the longer path to give you that extra second of reaction time. Now every so often you'll want to spin around and aim down the lane where Swansea should be coming from. once he's standing there take a shot and if you hit him then you'll get the achievement.
Check out my video guide for this if you need a better idea of how I did this.
And there you go! 100% of the achievements in Mouthwashing.
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Thanks for reading/watching!