Using the submarine concept I gave you create yourself a sub like that. By using a submarine of your own making you would be more familair with it than if someone else gave it to you. Just use your imagination.
Than simply ignore all the objectives and explore map until all those achievements pop-out. You can safely ram into things unless they knock you so strong that you would fall into water.

Play on your own server with maximum difficulty and only endworms enabled as enemies.
Select monster hunt quest.
Get a lot of nukes from "additional cargo" if you haven't made some already by submarine editor.
Additionally you can find endworm's xml file and set it's health to 1. Don't let the endworm touch rotor. Just remember to put it back to 10000 once you finish achievement gaining. Unmodded servers won't let you in I guess.
Killing with submarine rotors won't count as your kill. Same for the rest of monster hunt achievements.
You're survival isn't mandatory to complete this task. Same for other monster killing achievements.

You have to kill 100 humans.
Spawn a lot of bots on your ship on a private server.
Get detonator, C-4, wire and a button from "additional cargo". Get more if you are unsure and better do this.
You're in good situation if you're sub has no inside waypoints. Make all bots spawn in one spot via spawnpoints. You can simply give your sub just one spawnpoint for everyone (including yourself).
Detonate them all at once and repeat all over until pop-out.

If this doesn't work just kill non-bot humans. Try private server with lot of friends or a public.

Set difficulty to absolute minimum and disable enemies.
On a seed that features great depth simply reach that depth.
Afterwards you can unlock "A gaze into the abyss" and "The lone sailor" while also doing a cargo mission to get 3 more achievements at once.

Use your private server.
Use "additional cargo" to get morbusine and stun baton with fulgurium battery cell if you won't have them on ship with. Also handcuffs.
Start a round with one bot.
Kill the bot by stunning, cuffing and fully injecting with morbusine.
Bonus if you force him to have clown suit and mask on self before killing for "No fun allowed" achievement. Also if he's a traitor you will get "Not on my watch". If you are the traitor ordered to kill him you will receive "Insurgency" achievement.

I can't help here but you don't have to be in editor 24 hours in a row.
If you have doubt whenever you already unlocked it or not because you could move away from PC or something you can check your achievements.

Set difficulty to maximum on private server.
Grind your kills. Shuttle rotors can drain health quickly but it won't count as killing.

Play on private server with no enemies.
Find an empty abyss space (critical depth).
Just make your submarine constantly go straight in one direction. Try to prevent vertical movement.
Wait for pop-out but honestly it takes a long time and you can unlock other achievements in the meantime.

Do not use cheatsy submarine concept I gave you.
Set difficulty on private server to maximum.
Start combat mission with a bot.
Don't do anything and wait for your opponent to just kill himself on he's way.

Another version (in case if enemy won't move):
You can use cheatsy concept.
Monsters are disabled and difficulty is lowest.
Fight alone with one bot in opposite team.
Use a nuclear shell to kill your opponent with constant blast explosions. Railgun should only be on top of submarine so you're enemy won't reach you.

Lure a creature.
Have your submarine not doing horizontal movements so engine rotors won't kill your opponent for you.

Best when enemies are disabled.
Enchance force of one of your engines so you can achieve that horizontal treshold.

Use a default submarine.
You must be inside during explosion.
After you set it to melting point escape before explosion will occur.
Get back after explosion and fix everything. Prepare diving suit and tools.
Get to the second outpost. Easier if enemies are disabled.

Try to create in editor a wreck that features no threats.
Remove from the game files other wrecks but store them somewhere safely to later return them.
Play with enemies disabled and do the mission normally.

Have enemies disabled on your private server.
You have to complete a round, so you can have no mission.
Just get to the second outpost.

Just in case play as a doctor.
Inject yourself with husk.
Use calyxanide immediately, after husk injection.

Just start the round with additional cargo of full clown gear.

Have enemies disabled.
Start a round with lots of backup oxygenite tanks and underwater scooter with lots of regular batteries in backup.
Venture in a diving suit away enough.

Aternate way:
Have enemies disabled.
Have only one shuttle engine so rotors won't kill you while evacuating yourself. Just remember to make it give enough movement force.
Set your autopilot to go to second outpost.
Just abandon ship but also have at least 3 oxygenite tanks for spare.

Have enemies disabled.
Just collect your mission artifact as normal.
If that artifact is nasanov, skyholder or thermal than your task is easier as you won't suffer from hallucinations which you can ignore anyway or ion pulses. You have that artifact room for something.

Does not work on humans.
Play on server with only husks as enemies on lowest difficulty. Husks because they deal low damage.
Fight them directly by parking your submarine the way your rotors would be disabled.
Perhaps they may not be able to board you.
Stun them first but don't kill with stun baton. Just use welding tool.

Alternatively if it works on humans for some reason you can just stun a spawned bot and weld him to death.

Make your devices vulnerable to sabotage and destruction.
Replace shuttle engines with regular ones so they can break under water upon activating or just being under it.
Destroy every device you only safely can.
And than perform nuclear meltdown.

Alright, if this doesn't work just disable all enemies and go in a vanilla submarine into the abyss. Try to survive as long as possible. Also before hitting critical depth but already being on your way try to overload and melt your reactor.

Well, disable all enemies and steer to the second outpost without hitting anything I guess.

Play as a doctor.
Play with a bot.
Stun the bot. Also cuff.
Inject morbusine.
Wait until state is critical so the healthbar is completely empty.
Use morbusine antidote.
Maybe also inject liquid oxygenite.

Take morphine as non-doctor. Maybe more until you get addict.
You can use naloxone to haste opiate addiciton recovery. Do this right after addiciton. Maybe bring multiple naloxones.

Sabotage a device and than fix it.
You should had unlocked it on your way to "Nuclear blast survivor" if you had unlocked it according to my instructions.