There are 4 different awards you can get on any given level in Dusk. They are shown above.

Each award on a level upgrades the level select icon from Rust > Bronze > Silver > Gold > Evil, with zero, one, two, three, and all four awards respectively.
The requirements for each award is as follows:

• Completionist: Kill every enemy and find every secret in the level. This must be done in one run through the level, if you kill every enemy then leave, then come back and find every secret, you won't get the award.
  
• Low Tech: Complete the level with the only damage dealt being melee, reflected projectiles, or throwable damage. You can still shoot guns as long as they don't hit any enemies.
  
• Pacifist: Complete the level without harming a single enemy. Despite a simple concept on paper, it is a bit more complicated than it seems. For one, enemies can still kill each other without disqualifying the award, and you can still damage and kill enemies with reflected projectiles. However, if an enemy dies to an explosive barrel, even if you weren't the one to blow it up, it will void the pacifist run. This may apply to other explosives, such as the Welder's death explosion or the Cowgirl's attack.
  
• Untouchable: Complete the level without taking any damage. Simple as that, if you have enough skill.

This guide will cover all of the awards excluding Completionist. For that, I'd recommend Zhnigo's guide below. https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2965992024

This guide is still a work in progress. Lemme know of any methods that I don't include or any incorrect information.

You can get all three of these in one run through.

First things first: You'll need to pick up the can of gas behind you and throw it over the leathernecks to break open the cracked wall behind them. Be careful to not accidentally hit any of them with the explosion.
Run into the tunnel, then take a right then a left. You may want to save here, the next room is gonna take a bit of dodging to get out of unscathed. Move into the room in the middle, run past the enemies and hit the switch on the backside of this ladder. Then climb up and run out of the building.

Run past the house, slide under the wood that serves as the sliding tutorial, and you're done.

Once again, you can get all of these in one run. It's pretty easy too, if you do a little skip.

Make sure that you have a crossbow with about 10 bolts.

When the map starts, run straight until you see these two buildings. Run on top of the first one and jump onto the blue door shed.

Stand near the back of the roof, and look straight down, then jump and shoot about 8 arrows downwards.

By then you should have enough height to move forward and make it out of bounds. Shoot a few more arrows at your feet so that you keep enough height to land inside of the exit hallway. From there, just hit the exit door.

This method is very fast as well- the developer time is 4:30, but I was able to get it down to 10 seconds. There are faster methods, but they require losing health, which would void the Untouchable award.

As a bonus, if you don't want to skip the whole level and want to do untouchable only, there is still a way to cheese the boss fight. Using the crossbow, you can damage the bosses without even spawning them in. To do so, shoot in this general area.

No matter what you do, this level is gonna be pretty damn hard to nohit. I'll show you the easiest route that I've found.

First things first, you'll want to skip the starting section with all the buttons that spawn enemies. To do so, you'll need the soap. It's behind the church on the left side on top of a barrel.

Take the soap and throw it at the upper back of the church to break it open. Then crouch jump into the church and throw the soap at the altar thing that leads to the underground section to break it open as well.

Once you find yourself at the top of the spiral staircase, I'd recommend not jumping down immediately, so that the enemies start to climb the stairs, as it will mean that you will have less enemies to deal with at the bottom. Once the enemies are a good ways up the stairs, drop down and prepare yourself for some super cramped rooms. Run as fast as you can to the door marked in the image, and run through.

Then squeeze through the enemies and run down the stairs before turning right. Head through that door and be careful of the cartdog on the other side of the door.

Make sure to grab the red key and run through the two red doors.

At this point, you'll reach the last hallway before the exit. Be very careful about the two Grand Wizards at the end of the hallway, there isn't enough room for you to dodge the homing attacks so you should parry the attacks back with the sickles. Then run past and hit the exit portal.

Despite being one of the most enemy-dense levels in the game, it's the easiest to complete.

To get these awards, just hold s on your keyboard when you start the level. Eventually you'll get teleported to a very simple parkour section which lets you skip the level. It's as simple as that.

You get pacifist by default on this map, and there really isn't any tricks that'll make untouchable any easier. Low tech also seems impossible, as Nyarlathotep has an invisible wall preventing you from getting into melee distance with it. However, it is possible through the power of friendship (weird hitboxes).

Once you defeat Jakob with melee only (good luck with that though), you'll meet Stephan F. Weyte as usual. Shoot the crack in the ceiling as you'd do normally, and then pull out your sword. You can only hit it during 2 attacks out of the 4 that it can do, and the area to aim for is different for both of them. Try to stay on the left side of the arena, and wait for it to do a sweep attack. When it winds it up, jump on the jump pad and charge attack the areas marked in the screenshots with an X, depending on which side it is winding up.

Rinse and repeat, and then shoot the next crack, and rinse and repeat, and so on so forth. Eventually you'll win and get an award that I don't think most people would think is possible.

This guide isn't finished yet, I'm updating it as I go through and get these awards myself, and find routes. If you have any skips / routes feel free to share them here, and I'll put them in the guide with credit if it's good. Thanks.