Mewgenics Guide: How to Unlock Every Grueling Achievement
You are going to harvest a mountain of feline organs to finish this game, so you might as well track your milestones efficiently.
Getting every single achievement in Mewgenics is going to cost you a terrifying amount of dead cats and whatever remains of your real world social life. When I first looked at the global completion stats for this roguelike, I actually laughed out loud. Barely anyone has cracked the endgame trophies. Edmund McMillen designed this nightmare to be a grueling generational grind. You are not meant to beat everything in a weekend. You are meant to breed an army of freaks, watch them die horribly, scrape up their remains, and try again.
The achievement list reflects that exact gameplay loop. There are 281 milestones and quite a few of them are completely hidden from the player. You just stumble into them by repeatedly throwing your beloved pets into the Boneyard. If you are barely surviving the Sewers right now, do yourself a massive favor and study my Beginner's Guide before reading further. You need foundational knowledge before you worry about full completion.
For those of you ready to suffer, I stretched out the massive achievement list into logical, readable categories. No more squinting at a wall of text. You can actually plan your runs instead of relying on blind luck.
The Hoarder's Tax
The easiest achievements involve the economic metagame happening inside your house. The weirdos living around your property demand constant tribute. Supplying them with living kittens, adult cats, or fresh corpses is how you upgrade your base. Tink wants kittens to unlock breeding modifiers. Frank needs adults to expand your house. The Mystery Man is running an organ trafficking ring and demands massive piles of dead cats.
If you want to optimize your living space to keep your cats happy before shipping them off to die, check out my House Design Guide.
Map Unlocks and Narrative Encounters
Progression in Mewgenics is mostly linear, but there are a few hidden zones and bizarre narrative sidequests to track down.
Class Mastery and The Meat Grinder
Mewgenics forces you to run a gauntlet with every single class. You have the Fighter, Mage, Thief, Druid, Butcher, Psychic, Monk, Jester, Tinkerer, Necromancer, Cleric, Tank, Hunter, and the basic Collarless cats.
You need pristine genetics to survive the later maps with the weaker classes. Read up on my Breeding & Genetics Guide so you know exactly which shapes and stats to isolate. When a good cat inevitably ages out of combat viability, do not toss them away. My Retired Veterans Guide shows you how to extract value from elderly soldiers.
Once you have your base skills, the game demands you take those classes into the endgame zones for the final pieces of their kit.
The Masochist Tiers: Bosses on Impossible
Everything I mentioned above is just a warm up. The true gatekeepers of the 100 percent completion club are the difficulty modifiers.
The game demands you defeat every major boss on Hard, Crazy, and Impossible difficulties. I strongly recommend keeping my Boss Strategies Guide open on a second monitor while you attempt these fights. The mechanics change drastically on higher difficulties and going in blind guarantees a total wipe. You will also need to abuse every glitch and mechanical quirk available, which I catalog in my Advanced Tips & Secrets breakdown.
Achieving 100 percent in Mewgenics proves you have mastered a deliberately unfair system. Keep breeding, keep hoarding organs, and accept that your favorite cats are absolutely going to die for the greater good.
