I Did It Boys - All Killer Teachables

Last one was the Deathslinger. Before him, it was the Hag. I got Ruin off of the Shrine a long time ago and never bothered to level her up. I believe my first killer to 40 was Legion, followed by either Myers or Nurse.

I don't have all perks unlocked on everyone yet, just the teachables are all unlocked to potentially grab. However, survivor I've only got Meg to max - the rest of my perks have been from Shrines. Here's the load-out for my survivor and favorite killers.

Meg: Sprint Burst, Adrenaline, Spine Chill, Kindred

• Spine Chill I would absolutely never take off of my survivors. Kindred is amazing as well for providing map-wide aura coverage.
• I may replace Adrenaline with Urban Evasion if I find an archive challenge would better suit it.

Nurse: Barbecue and Chili, Discordance, NOED, Whispers

• Whispers I probably use more than I should, but it is such a great perk for not wasting your time.
• Some may call it scummy, but NOED is an absolute beast on Nurse.
• Discordance helps a ton in the beginning especially, knowing where to go first. Also helps prioritize generators throughout the match.

Legion: Ruin, Sloppy Butcher, Surveillance, Barbecue and Chili

• Legion has very good pressure and the ability to keep people bouncing on and off of generators. This makes the Ruin + Surveillance combo very good for as long as Ruin can stay up.
• Surveillance on its own is great for locating survivors when there are only a couple left.
• Sloppy Butcher is a must-have on Legion for increasing that time off of generators. If people refuse to heal, they are playing a dangerous game with Legion's ability to run ahead and zone people off.

Ghostface: Save the Best for Last, Pop Goes the Weasel, Whispers, -

• I play around with his last perk a lot. Right now I've got Thanatophobia because I found higher-level players tend to refuse healing more often. Definitely not the best option though. Barbecue is okay, but he doesn't have much of an ability to utilize it to its fullest potential. I'd consider something like Brutal Strength for taking care of terrible pallets or Make Your Choice if you are good about using it. Whenever I use MYC, I tend to inadvertently ignore it and it never gets used.
• Save the Best for Last is great for chaining hits on survivors, and is also why I was originally using Thanatophobia.

Deathslinger: Barbecue and Chili, Discordance, A Nurse's Calling, Pop Goes the Weasel

• I'll start with Pop Goes the Weasel. Given his slow speed, you need to zone off a couple generators at a time when you chase people. Don't kick a generator people are actively working on, but kick one you just pulled a single person off of that other survivors don't know of. By the time the original is hooked, hopefully their progress is lost.
• A Nurse's Calling is 100% a must-have. Never replace it. His terror radius doesn't do a great job of telling his distance, and he can be right up on you before you know it. This is great with heavy foliage or obstacles where survivors can't see you. You can just pop around a corner and quick-scope the injured survivor. Great for cornfields too.
• Discordance is a great perk for prioritizing, like I said earlier. You could switch off to another perk, but I prefer having assurance of where to go at the beginning especially.
• Barbecue and Chili is alright on him. He's slow, so he can't utilize it quite as well. I would recommend switching either this or Discordance with Monitor and Abuse (I don't have it unlocked on him yet). Either way, it still gives good indicators of where survivors are at since most people probably won't run BBQ on Deathslinger.

It's definitely not hard per se, just very time consuming. Something many people just wont ever achieve, be it not buying DLC or just not caring about some perks.