Here's a list as of post 1049 (page 105 with default posts per page).
The creatures are sorted alphabetically. When searching to see if a creature has been done, and it has more than one word (e.g Cloud Giant, search for one word in case it has been done as Giant, Cloud (Cloud Giant has been done)).
The A-M and N-Z are split into two posts as they were getting too big together in post 181. Here is A-M.
[SBLOCK=A]Aarakocra
Aartuk
Aasimar
Abeil
Abrian
Acheierai
Aerial Servant
Afanc
Agony Beetle
Air Elemental
Algoid
Allip
Al-miraj
Amphisbaena
Anakore
Anaxim
Angel
Anguillian
Animated Object
Ankheg
Annis Hag
Aranea
Arcane
Armand
Arrowhawk
Asabi
Ascallion
Ascomoid
Aspis Drone
Assassin Vine
Astral Dreadnought
Astral Stalker
Atomie
Aurumvorax
Avangion
Ax Beak
[/SBLOCK][SBLOCK=B]Baazrag
Babau Demon
Bahamut
Bajang
Bakemono
Balor
Banedead
Banelar
Banshee
Barghest
Bariaur
Basalisk
Basidirond
Battle Briar
Bebilith
Behir
Beholder
Beholder Eater
Berbalang
Bhut
Black Pudding
Bladeling
Bleakborn
Blindheim
Bloodthorn
Blue Slaad
Bog Wader
Boggard
Brain Golem
Brain Mole
Brown Dragon
Brownie
Bugbear
Bullette
Buraaq
[/SBLOCK][SBLOCK=C]Cacodemon
Cadaver Collector
Caller In Darkness
Cambion
Campestri
Carbuncle
Carcass Crab
Carcass Eater
Carnage Demon
Carrion Crawler
Carrionette
Caryatid Column
Caterwaul
Catoblepas
Caulborn
Cave Fisher
Centaur
Chac
Changecat
Chaos Beast
Charnel Hound
Chimera
Choker
Chosen One
Chososion
Chuul
Cifal
Cilops
Cisternfiend
Clay Golem
Cloud Giant
Cockatrice
Colossus Wood
Concordant Killer
Crypt Servant
[/SBLOCK][SBLOCK=D]Dabus
Dancing Dead
Dancing Hut of Baba Yaga
Dark Creeper
Dark Naga
Dark Tree
Darken Beast
Darkmantle
Darksun Dragon
Darktentakles
Death Dog
Deepspawn
Defacer
Delver
Demodand
Demogorgon
Dire Shark
Disenchanter
Displacer Beast
Djinni
Dohwar
Dolphin
Doppelganager
Dragon
Dragon Turtle
Dragonborn
Dragonfly Turtle
Drider
Drow
Duckbunny
Dune Stalker
Dwarf
Dwarven Banshee
D'ziriak
[/SBLOCK][SBLOCK=E]Eagle
Ear Seeker
Earth Elemental
Eblis
Ectoplasmic Ooze
Effigy
Efreet
Eladrin, Firre
Elasmosaurus
Elder Brain
Elder Thing
Elemental of Blood
Elemental Storm
Elemental, Grue
Elephant
Elf
Elmarin
Else Whale
Elven Dog
Elysian Thrush
Entomber
Entropic Ogre Mage
Enveloper
Ephemeral Swarm
Erinyes
Ermalkankari
Ermordenung
Ethereal Filcher
Ethereal Marauder
Ettercap
Ettin
Executioner's Hood
Eye Killer
Eye of Fear and Flame
Eye of the Deep
[/SBLOCK][SBLOCK=F]Faceless Stalker
Facet
Fachen
Fairy Fiddler
Famine Spirit
Farspawn
Faun
Felldrake, Crested
Feral Yowler
Feyr
Fey'ri
Firbolg
Fire Bat
Fire Cult Warrior
Fire Giant
Fire Monolith
Fire Newt
Firebeetle
Flail Snail
Flame Snake
Flameskull
Flesh Jelly
Flumph
Flytrap, Giant
Fomorian
Foo
Forest Sloth
Forestkith Goblin
Formian
Forsaken
Foxwoman
Frigidarch
Frost Giant
Frost Salamander
Frost Worm
[/SBLOCK][SBLOCK=G]Gaj
Galeb Duhr
Gambado
Gambol
Gammaroid
Garbug
Gargoyle
Gas Spore
Gasper
Genie
Ghast
Ghaunadan
Ghoul
Giant Strider
Giant, Bog
Gibbering Mouther
Giff
Girallon
Githyanki
Githzerai
Glabrezu
Gnoll
Golem, Hangman
Goliath
Gorgon
Goristro
Green Hag
Grey Glutton
Grey Ooze
Grey Render
Grimlock
Grimweird
Grindylow
Guardian
[/SBLOCK][SBLOCK=H]Hadozee
Hagunemnon
Hair, Living
Half-Fiend
Halfling Vampire
Half-magma Feylaar
Hannya
Harpoon Spider
Harpy
Harssef
Hatori
Head Hunter
Hej-kin
Hell Hound
Hellcat
Helmed Horror
Hengeyokai
Heucuva
Hezrou
Hieracosphinx
High Irda
Hill Giant
Hippocampus
Hippogriff
Hippogriff, Pseudonatural
Hobgoblin
Hollyphant
Homunculus
Hook Horror
Horax
Horse, Draft
Howler
Hulking Corpse
Hullathoin
Human
Hybsil
[/SBLOCK][SBLOCK=I]Ibixian
Ibrandlin
Ice Devil
Ice Serpent
Ice Toad
Ice Vampire
Id Fiend
IffanbutT
Ifrit
Igundi
Ijiraq
Ikiryo
Iko-Turso
Illithilich
Illurien
Imix
Immolation Devil
Immoth
Imp
Incubus
Indricothere
Inevitable, Kolyarut
Inevitable, Marut
Inferno Spider
Intellect Devourer
Invisible Flying Ray
Invisible Stalker
Iron Clad Mauler
Iron Cobra
Iron Golem
Iron Tusker
Ironmaw
Ishikorobukuru
Isychiros
Ixitxachitl
[/SBLOCK][SBLOCK=J]Jabberwok
Jacinth Dragon
Jackalope
Jackel Lord
Jackelwere
Jackfrost
Jaculi
Jagre
Jahi
Jaleeda Bird
Jammer Leech
Jann
Jarbo
Jelly, Slithering Tracker
Jellyfish Swarm
Jellyfish, Giant
Jellyfish, Giant, Portuguese Man-of-War
Jermlaine
Jhakar
Jiki-Ketsu-Gaki
Jishun Mushi
Jolly Roger
Jorri
Jovoc Demon
Joystealer
Jozhal
Jub-Jub Bird
Juggernaut
Juhrion
Juiblex
Juju Zombie
Julajimus
Jungle Giant
Justicator
[/SBLOCK][SBLOCK=K]Kaisharga
Kamadan
Kani Doll
Kank
Kaorti
Kapak Draconian
Kapoacinth
Karranthi Skeleton
Kartoeba
Kech
Keeper
Kelpie
Kender
Kenku
Khaasta
Khajit
Kigrid
Killer Frog
Killoren
Kilmoulis
Ki-rin
Klurichir
Knell Beetle
Kobold
Kodama Kami
Kopru
Korred
Kostchtchie
Kraken
Krenshar
Kuldurath
Kuo-toa
Kuwa
Kython
Kyton
[/SBLOCK][SBLOCK=L]Laerti
Lamia
Lammasu
Lava Dragon
Lava Mephit
Leach Swarm
Leachwalker
Leech Toad
Lemure
Leng Spider
Lensman
Leonal
Leprechaun
Leskylor, 3 Headed
Leucrotta
Lhee
Lhiannan Shee
Lhosk
Lich
Lillend
Limbo Stalker
Linnorm
Lirr
Living Holocaust
Living Spell
Living Spell: Cloudkill
Living Steel
Living Wall
Lizardfolk
Locatah
Locathah
Lolth
Loxo
Lumi
Lunar Ravager
Lurker Above
Lurking Strangler
[/SBLOCK][SBLOCK=M]Mad Slasher
Maelephant
Maenad
Magebane
Mageripper Swarm
Maggot Golem
Magic Golem
Magman
Mammoth
Mamono
Mantari
Manticore
Margyle
Marilith
Marrash
Marzanna
Maug
Maugoth
Meazel
Medusa
Meenlock
Megapede
Mephit
Merrow
Mihstu
Mimic
Mind Flayer
Mivilorn
Modron
Mohrg
Mongrelman
Mudmaw
Mummy, Salt
Myconid
[/SBLOCK]