This is a basic list of the Rituals in CoE5 (v5.21)

In-depth details are at Google Docs:
https://docs.google.com/spreadsheets/d/1nboFWYKpFNFtAu4nN_ZnQ0yNW-Mz3pYegDx9fVUr7Q4/edit#gid=1982340553

Level 1
Make Effigy
Summon Lesser Beings
Summon Lesser Oni

Level 2
Mountain Lair
Summon Greater Beings
Summon Oni

Level 3
Summon King

Spirit Guide
Level 1
Make Effigy
Pierce the Veil of Death
Sending
Summon Ancestor

Level 2
Carve Totempole
Promise of the Ancestors
Summon Heroes of Old

Level 3
Army of Legends
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Priestess/Sorceress
Level 1
Paint Tattoo

Crystal Priestess
Level 1
Design Eagle Tattoo
Level 2
Design Pegasus Tattoo

Garnet Priestess
Level 1
Design Lion Tattoo
Level 2
Design Gryphon Tattoo

Jade Priestess
Level 1
Design Serpent Tattoo
Level 2
Design Hydra Tattoo

Onyx Priestess
Level 1
Design Badger Tattoo
Level 2
Design Skull Tattoo

Coronation
Level 1
Raise Levies
Swift Justice
Raise Fort

Level 2
Appoint Vassal
Relocate Manor

Level 3
Raise Castle
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Alchemist
Level 1
Alchemy

Level 2
Greater Alchemy
Alchemical Catapult
Alchemical Trebuchet
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Monk
Benediction

Level 1
Drain Swamp

Level 2
Found Monastery

Level 1
Create Hoburg Village
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Horologist
Level 1
Diamond Construct
Emerald Construct
Ruby Construct
Sapphire Construct

Level 2
Construct Ferrous Wheel
Diamond Iron Dragon
Emerald Iron Dragon
Ruby Iron Dragon
Sapphire Iron Dragon
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Horticulturist
Level 1
Create Hoburg Village

Level 2
Animal Summoning
Farm Animal Summoning

Level 3
Great Animal Summoning
Summon Guardian of the Hoburgs

Level 1
Diamond Alchemy
Lesser Sky Summoning

Level 2
Greater Sky Summoning
Rainbow Curtain
Shape Clouds
Summon Mist Warrior
Summon Storm Giant
Summon Yeti

Level 3
Cloud Castle
Fimbul Fortress
Perpetual Storm
Summon Frost Giant
Summon Queen of Air
Summon Solar Eagle

Level 1
Demon Summoning
Imp Summoning
Personal Gate

Level 2
Greater Demon Summoning
Infernal Horde
Returning
Summon Demon Lieutenant
Wall of Torment

Level 3
Infernal Gate
Summon Demon Lord

Level 1
Messenger Crows
Minor Animal Summoning
Plant Forest Guardians

Level 2
Heart of the Forest
Lord of the Wild
Major Animal Summoning
Revive Ancient Forest
Summon Mythic Beasts
Wild Hunt

Level 3
Call Primal Being
Faery Paths
Sheperds of the Wood
Summon Legendary Beings

Level 1
Bramble Fort
Create Sacred Grove
Minor Animal Summoning

Level 2
Blood Orgy
Call of Gaia
Create Grove of Gaia
Major Animal Summoning
Plant Hamadryad

Level 3
Call of the Wild
Create Primal Forest
Incarnate Earth Mother
Summon Servants of Gaia

Level 1
Create Iron Gate
Lore of Dvalin I
Sense Mines

Level 2
Create Rune Smith
Enchant Gate
Lore of Dvalin II

Level 3
Living Boulders
Lore of Dvalin III
Portal of Dvalin
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Councilor
level 1
Found Colony
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Rune Smith
level 1
Create Armor of Dvalin
Create Furnace Armor
Create Rime Armor

level 2
Earth Brand Ballista
Earth Brand Weapons
Flame Brand Ballista
Flame Brand Weapons
Rime Brand Ballista
Rime Brand Weapons

Level 1
Animate Armor
Animate Bow
Animate Spear
Animate Sword
Animate Tools
Craft Gargoyle
Create Flesh Golem
Create Mimic
Sculpt Terracotta Soldier

Level 2
Animate Ballista
Animate Quills and Scrolls
Craft Guardian
Create Clay Golem
Create Ice Golem
Create Juggernaut
Create Necrotod
Create Stone Golem
Create Wood Golem
Dogs of Gold and Silver
Enchanted Gate
Enliven Statue
Iron Grafting

Level 3
Brass Bull
Create Artifact
Create Crystal Golem
Create Gold Golem
Create Home Portal
Create Iron Golem
Create Oak Golem
Create Onyx Golem
Create Portal
Create Silver Golem
Infuse Magic Academy
Infuse Magic Library

Level 1
Astrology
Call of the Deep
Call Warriors of the Deep
Ceremony in the Deep
Contact Elder Being

Level 2
Call Army of the Deep
Contact Old Ones
Greater Ceremony in the Deep

Level 3
Call Outer God
Deep Rising
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Starspawn
Level 1
Astrology
Call Elder Beings
Horoscope

Level 2
Send Lesser Horror

Level 3
Send Greater Horror

Level 1
Lesser Blood Feast
Lesser Ceremony to Baal

Level 2
Blood Feast
Ceremony to Baal

Level 3
Banquet for the Dead
Grand Blood Feast
Grand Ceremony to Baal
Second Sun
Summon God

Level 1
Capture Images
Capture Spell
Floating Eye

Level 2
Capture Greater Spell
Capture Images
Capture Phantasms
Capture Spell
Mirror Blink
Mirror Walk
Mirror Wall
Scrying
Summon Phase Beast
Veil Mine

Level 3
Capture Greater Spell
Capture Phantasms
Create Simulacrum
Fata Morgana
Mirror Gate
Palace of Everchanging Dreams

Common Rituals
Level 1
Kobold Hatchery
Level 2
Summon Dragon
Foretelling
Kobold Stronghold
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Black Kobolds
Level 1
Decay Rune Trap
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Blue Kobolds
Level 1
Frost Rune Trap
Level 3
Summon Elder Dragon
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Green Kobolds
Level 1
Poison Gas Trap
Level 3
Summon Elder Dragon
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Red Kobolds
Level 1
Flame Rune Trap
Level 3
Summon Elder Dragon
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White Kobolds
Level 1
Lightning Rune Trap
Level 3
Summon Elder Dragon

Level 1
Dark Knowledge
Flesh Rite
Minor Summoning
Raise Dead
Raven Spy
Reanimate Animals
Twiceborn

Level 2
Animate Abomination
Blood Rite
Creat Flesh Golem
Major Summoning
Ravenous Curse

Level 3
Blood Servant

Devala / Devata / Immortal Siddha / Kinnara / Parvati the Devi of Harmony / Siddha
Level 1
Diamond Summoning
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Kali the Devi of Darkness
Level 1
Ruby Summoning
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Kamadhenu the Cow of Plenty
Level 1
Lesser Akashic Summing
Level 2
Akashic Summoning
Akashic Records
Level 3
Greater Akashic Summoning
Avatara
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Marut General
Level 1
Ruby Summoning
..............................................................................................................................................................
Nagaraja/Nagarishi
Level 1
Sapphire Summoning
..............................................................................................................................................................
Marut General
Level 1
Ruby Summoning
Level 2
Host of Maruts
..............................................................................................................................................................
Shiva the Nataraja
Level 1
Diamond Summoning
Level 2
Turning of the Wheel
..............................................................................................................................................................
Yaksha
Level 1
Emerald Summoning
Inhabit Jungle
..............................................................................................................................................................
Yakshini
Level 1
Sapphire Summoning
Inhabit Lake
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Yogi
Level 1
Lesser Akashic Summing
Level 2
Akashic Summoning
Akashic Records
Level 3
Greater Akashic Summoning
Avatara

Level 1
Dark Knowledge
Minor Summoning
Pierce the Veil of Death
Raise Dead
Raven Spy
Reanimate Animals
Twiceborn

Level 2
Animate Abomination
Blood Rite
Major Summoning
Mummification
Pyramid of Skulls
Raise Legion
Ravenous Curse
Stygian Paths
Wall of Unlife

Level 3
Lichcraft
Planar Swap
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Demilich
Level 3
Lich Gate

Level 1
Awaken Guardians
Cave Temple Construction
Lesser Deep Summoning
Lesser Lava Summoning
Lesser Olm Summoning
Lesser Summoning of the Dead
Scrying

Level 2
Awaken Marble Oracle
Deep Earth Summoning
Lava Summoning
Olm Conclave
Summoning of the Dead

Level 3
Earth made Flesh

Level 1
Ceremony of the Lord of Bloody Mother (Priest of the Bloody Mother)
Ceremony of the Lord of Death (Priest of the Dead)
Ceremony of the Lord of Night (Moon Priest)
Ceremony of the Lord of Rain (Rain Priest)
Ceremony of the Lord of Sky (Sky Priest)
Ceremony of the Lord of War (War and Sun Priest)

Level 2
Greater Ceremony of the Lord of Bloody Mother (Priest of the Bloody Mother)
Greater Ceremony of the Lord of Death (Priest of the Dead)
Greater Ceremony of the Lord of Night (Moon Priest)
Greater Ceremony of the Lord of Rain (Rain Priest)
Greater Ceremony of the Lord of Sky (Sky Priest)
Greater Ceremony of the Lord of War (War and Sun Priest)

Level 3
Summon God (all priests)

Level 1
Naraka Summoning
Lanka Summoning
Summon the Dead
Bhuta Possession

Level 2
Greater Narake Summoning
Greater Lanka Summoning
Veil Village

Level 3
Shroud of Darkness
Rasatala Summoning
Veil of Dreams

Level 1
Call of the Pyramid
Construct Pillar of Power
Dark Bonds
Scourge Summons

Level 2
Appoint Heralds
Call of the Pillar
Construct Guardian
Construct Pyramid of Power
Dark Blessing
Dark Scourge Summons
Pyramid Walls

Level 3
Black Scourge Summons
Construct Mountain of Power
Pyramid Gate

Level 2
Coronation

Level 3
Apotheosis
Appoint Governor
Erect Statue
Imperial Wedding
Planar Swap
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Empress
Level 3
Apotheosis
..............................................................................................................................................................
Magistratus
Level 1
Erect Imperial Statue
Erect Statue of the Underworld
Raise Limitanei
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Renatus
Level 1
Anabasis
Katabasis
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Reveler
Level 1
Build Lararium
Incite Revelry

Level 1
Plant Giant Fungus
Vision Brew
Wither Wood

Level 2
Activate Fairy Circle
Call the Old Forest
Golden Nose
Plant Shadow Tree

Level 3
Clamor and Clang
Stygian Bath
Summon Linnorm
Summon Orm

Convert Settlement
Break the seal
Increase Divine Favor
Bolster Devotion
Start Crusade
Call the Inquisition
Ceremony of Mastery

Warlock Apprentice
Flame Pact
Water Pact
Storm Pact
Earth Pact
Level 1
Lesser Fire Summoning
Lesser Water Summoning
Lesser Air Summoning
Lesser Earth Summoning
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Warlock (Air)
Storm Pact
Greater Storm Pact
Level 1
Lesser Air Summoning

Level 2
Curtain of Storms
Greater Air Summoning
Summon Champion of Air
Summon Mist Warrior
Summon Smoke Warrior
Summon Yeti

Level 3
Cloud Castle
Perpetual Storm
Summon Queen of Air
Wheel of Storm and Stone

Storm Giant [Warlock (Air)]
Level 1
King of Giants
Level 2
Call Giants
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Warlock (Earth)
Earth Pact
Greater Earth Pact
Level 1
Lesser Earth Summoning

Level 2
Dig
Greater Earth Summoning
Ramparts of Earth
Summon Champion of Earth
Summon Magma Warrior
Summon Mud Warrior

Level 3
Raise Volcano
Summon King of Earth
Wheel of Storm and Stone
Wizard's Tower

Cyclops [Warlock (Earth)]
Level 1
King of Giants
Level 2
Call Giants
Create Artifact
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Warlock (Fire)
Flame Pact
Greater Flame Pact
Level 1
Lesser Fire Summoning

Level 2
Circle of Flames
Greater Fire Summoning
Summon Champion of Fire
Summon Magma Warrior
Summon Smoke Warrior
Vafur Flames

Level 3
Eternal Pyre
Summon King of Fire
Wheel of Frost and Flames

Fire Giant [Warlock (Fire)]
Level 1
King of Giants
Level 2
Call Giants
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Warlock (Water)
Water Pact
Greater Water Pact
Level 1
Lesser Water Summoning

Level 2
Enchant Lake
Greater Water Summoning
Maelstrom
Summon Champion of Water
Summon Mist Warrior
Summon Mud Warrior
Summon Yeti

Level 3
Fimbul Fortress
Primal Maelstrom
Summon Queen of Water
Wheel of Frost and Flames

Frost Giant [Warlock (Water)]
Level 1
King of Giants
Level 2
Call Giants
Call Winter Wolves

Sea Giant [Warlock (Water)]
Level 1
King of Giants
Level 2
Call Giants

Level 1
Bog Eye
Marshlands
Minor Summoning
Swamp Guardians

Level 2
Major Summoning
Miasma
Mirror Mirror
Murderous Mist

Level 3
Bog Path
Summon Old One
Swamp Soul