Irony Mod Manager Load Order:
1. Copy the below list to clipboard
2. Create a new mod list in Irony Mod Manager with the "+" button
3. Activate any mod
4. Right click on the activated mod
5. Select "Import Mod Order from Clipboard"
6. (Merging mods in Irony will cause some mods to malfunction, i.e. Aggressive Crisis Engine will stop working, so I recommend against merging if you don't know exactly what you are doing)
7. Select "Apply"
8. Close Irony Mod Manager
9. Open Vanilla Stellaris Launcher (click "play game" in Steam Stellaris), check that your current playset includes the correct mod order from Irony, and click play game
(I always do steps 8 and 9, as that works well for me, and some have reported trouble when launching game through Irony - I don't know why)

Mod order:

~~Ariphaos Unofficial Patch (3.4)
UI Overhaul Dynamic
~ StarNet AI
(-NSC2 Season 6-)
Guilli's Planet Modifiers and Features
Planetary Diversity
Planetary Diversity - Unique Worlds
Planetary Diversity - More Arcologies
Planetary Diversity - Exotic Worlds
Planetary Diversity - Reworked Habitability
Planetary Diversity - Planetary Habitats
Planetary Diversity - Shroud Worlds
Planetary Diversity - Space Habitats
Planetary Diversity - Gaia Worlds
Planetary Diversity - Ringworlds
Gigastructural Engineering & More (3.4)
! Immersive Beautiful Stellaris !
Expanded Stellaris Traditions
More Events Mod
36 Building Slots
*Remastered Human Portraits
Flags, Emblems and Backgrounds Merged
Animated Saurian Portraits
Archaeology Story Pack
Precursor Story Pack
Endless Frontier: An Event Mod
Fatal Foundations Story Pack [3.4]
Extra Events 3.4
Dynamic Mod Menu [3.4.*]
Galactic Imperial Tax
Machine Leader Repairer
Hive World Fixes
Cosmic Feast
Necrats
AI-Player Exclusive Archaeology
ACOT: Make Dark Matter Dark Again
Curators can sell minor artifacts
Buy artifacts
Xenology : Traits Expansion Unofficial - Biological Module (3.4.X)
Diverse Prosperous Unifications
Hive Slaves
Hive Reanimators
Hive World Origin
Ascension Perks Broadened 3.4
All Anomaly Spawns
Bypass Adjustments
Extended Aquatics
Expanded Xeno Diplomacy
AA's Galaxy of Criminals (3.4)
AA's Cyborgs Species Pack
Ascendant Stars (3.4)
AA's Some Other Origin (3.4)
Expanded Gestalts: Forgotten Queens
Hands of State (3.4)
Music of the Clone Wars
Music of the Galactic Civil War
Music of the Old Republic Era
Music of the New Republic
Shadows of the Empire Soundtrack
Star Wars Empire Ships 3.4 NSC2 Edition
Destroy Archaeological Sites
AA's Consortiums (3.4)
Homeworld Ethics (3.4)
AA's Cyborg Origins (3.4)
Extended Necroids
Extended Machines
Eschatology
Extended Humanoids
Extended Plantoids
Civic Virtues I (3.4)
Dimorphism - Chirpy Portraits
Dimorphic Shark Portraits
Traditional Thinking (3.4)
Simple Traditions
Destructive Bombardment: Death from the Heavens
Tiny Outliner v2
Basic Ordinary Origins
Masters of Nature
Invasion! (3.4)
Even More Origins
DSKillcounter
Amazing Civics - Megacorp
Planet Raider
AA's Cyborg Ascendance (3.4)
Legendary Worlds 3.3
Planetary Wonders
Stellar Pioneers
"Terraform" to Tomb World
"Terraform" to Tomb World: Planetary Diversity Compatibility
Agreements Boost Diplomatic Weight
Guilli's Exploration And Expansion Tweaks
Penal Colony: Enhanced
Tier Numbers: Buildings
Tech Tiers
Extra Insults and Diplo Messages
5 Times Faster Reinforcement Transit
Primitive Worlds for 3.x
Primitive Conquest Enhancements
Starborn: Improved Voidtouched
Void Dwellers Expanded 3+
Space Elevators
Lunar Prospecting
Space Industry (Habitat Overhaul)
Plentiful Traditions 3.x
Legendary Hero Civic
Better Remnants
Technology Rubberbanding
Starfighters! [3.4]
Cross Border Trade
The Infinity Stones - Relics Update (Beta)
Banned! (3.4)
AA's Divided Loyalties (3.4)
Spaceborne Civs Expanded
Local Production
Elves of Stellaris
Acalians Civics
Moonbase
Claims Decay - Dynamic Diplomacy [3.4]
Technology Repeated
kRIEGERs 120 Added Empires
Technology Tree
Wider Tooltip
CommsNet (3.4)
All Leviathans Spawns
Give Technology & Fleets
UI Overhaul Dynamic + Planetary Diversity
UI Overhaul Dynamic - Ascension Slots
UI Overhaul Dynamic - More Tradition Categories (64)
UI Overhaul Dynamic + Tiny Outliner v2
Colourable Elves of Stellaris Ships
Elves of Stellaris - Planetary Diversity Patch v3.4
Elves of Stellaris NSC2 Compatibility Patch
Elves of Stellaris Gigastructures Art Pack
Guillified Precursor Story Pack (Compat Patch)
UI Overhaul Dynamic - Extended Topbar
UI Overhaul Dynamic - Checksum Schism Version
Extended Aquatics + PD
Planetary Diversity + Guilli's Planet Modifiers and Features
Giga Diversity 2 Electric Bugaloo
Expanded Mandates
Better Hegemony
AA's NTZs & DMZs (3.4)
Shut Up, We Don't Care! (3.4)
StarNet AI - Planetary Diversity compatibility patch
StarNet Mixed Fleet
! Starnet for NSC2
Aggressive Crisis Engine
Signature Weapons: Compatibility Edition
AI Game Performance Optimisation Fix
! Sartek Tradition - Ascension Perk Merger
!!Universal Modifier Patch (3.4.*)
! The Merger of Rules 3.4
!!!Universal Resource Patch [2.4+]