I was inspired by this Skyrim "Master Chef" run:
Although it's not on the skyrim leader boards because it's a silly category, I think this could be a potentially fun run category.
Basically the objective is to build a "zoo" with every piece of (movable) alien fauna and/or flora in it. It could either include or exclude sea emperor eggs. I would exclude them as it would then basically just be an Any% run without the rocket and sea emperor eggs aren't placeable in alien containment anyway.
AFAIK this would be: Eggs:
- Ampeel
- Boneshark
- Crabsnake
- Crabsquid
- Crashfish
- Cuddlefish
- Gasopod
- Jellyray
- Lava Lizard
- Mesmer
- Rabbit ray
- Sand Shark
- Spadefish
- Stalker
Grabbable Fauna:
- Bladderfish
- Boomerang
- Eyeye
- Garryfish
- Holefish
- Hoopfish
- Hoverfish
- Magmarang
- Oculus
- Peeper
- Red Eyeye
- Reginald
- Spadefish
- Spinefish
- Floater
Plantable Flora:
- Acid Mushroom
- Bloodvine
- Blue Palm
- Brain Coral
- Bulb Bush
- Cave Bush
- Creepvine
- Deep Shroom
- Eyestalk
- Furled Papyrus
- Gabe's Feather
- Gel Sack
- Ghostweed
- Jellyshroom
- Membrain
- Pygmy Fan
- Redwort
- Rogue Cradle
- Sea Crown
- Spiked Horn Grass
- Spotted Dockleaf
- Tiger Plant
- Veined Nettle
- Violet Beau
- Writhing Weed
Land Based Plants:
- Bulbo Tree
- Chinese Potato
- Fern Palm
- Grub Basket
- Jaffa Cup
- Lattern Tree
- Marblemelon Plant
- Pinkcap
- Speckled Rattler
- Voxel Shrub
I'm not talented enough to do an interesting speedrun of this, but it could be a unique challenge as you'd need to scan alien containment, exterior/interior growbeds and bring them all to a single location. I'd have the caveat that the "zoo" must all be located in a single base, and everything must be alive at the end of the run (tiger plant will kill your fish).