The real 1.24.2.1 update, but I accidentally doubled the mod size by placing a .zip of the mod in the upload folder.

1.24.2.0 Changelog:
ACHIEVEMENTS:
-Added an ui-based achievement system, similar to the one found in vanilla eu4. This means that achievements can only be earned in ironman mode, but unlike vanilla you can still inspect them outside of ironman.
-Added 12 achievements of varying difficulty for Elysia/Rhomania.
-Completing achievements will show a pop-up window, complete with a larger artwork and a short description.

EXARCHS:
-Added a new custom gui for exarchs, replacing the old system of decisions and diplomatic interactions. Actions such as granting and seizing provinces can now be done from the province view, while annexation and granting all provinces in the region can be done from the diplomatic tab.
-Added 4 new exarch interactions:
--Bolster Administration; which converts your diplomatic power to exarch's administrative power and forces them to spend all their admin on coring.
--Offer Military Assistance; which you can use to raise exarch's stability at the cost of your military power.
--Send Aid (toggled); which you can use to spend ducats in order to reduce the unrest in exarch's provinces and its liberty desire.
--Crack Down on Heresy (toggled); which you can use to make converting provinces in exarch's lands easier, at the cost of your relationship with heretics and heathens.
-Exarchs now have a higher baseline liberty desire, but get less liberty desire from development
-Exarchs now lose 5% liberty desire per positive stability point.
-Added a new flag for the exarch of Megáli Portogalía.
-Changed the symbol on Exarch of Aphrike's flag from a Punic one to a Berber one.
-Added Anatolian exarch, which can be formed after In Alexios' Footsteps is completed and you have sided with the Turks. If Orhan was taken his dynasty will take control of the exarch.
-Added the Exarchate of Illyria, separating it from Konstantinia.
-Added A Kastrioti Homecoming event, available only if Albanians were taken, where Skanderbeg's descendants can be put in charge of Illyria.
-Exarchs can now be released and played as, using a new diplomatic interaction.
-Added a new government reform for independent exarchs.
-Exarch of Aphrike can now form Carthage.
-Exarchs now adopt overlord's years of separatism modifier, and provinces retain separatism when swapped between an exarch and its overlord.
-Exarchs now copy the overlord's administrative efficiency and coring cost modifiers.
-Added the ability to turn old world vassals into Exarchs, provided no exarch exists yet in their capital region.
-Portuguese Exarch (and exarchs created from vassals) no longer automatically give you their provinces outside their home region, you now have to seize them via a new interaction.
-All exarchs now follow a fixed idea group progression.
-There is no longer a delay between you conquering a province and it being transferred to exarch. If you wish to retain the province you can use the new Assert Ownership button in the exarch's province gui.

CHANGES:
-Tier 3 of Alexandrian Library now adds a university to the province.
-Added a unique description for "The First Circumnavigation" event for Rhomania/Elysia.
-Completely rewrote the text for the events dealing with deceiving the Portuguese in order to remove the mentions of anachronistic super carrier pigeons and your demise somehow discouraging Europeans from sailing around Africa.
-Request Autocephaly decision will now always be approved by the AI, but it now requires 100 opinion with the holder of Ecumenical Patriarchate.
-Provinces with Supply Lines and Base of Operations modifiers will now be immediately ceded to exarchs when those modifiers are removed.
-In Alexios' Footsteps mission now requires 10 less provinces in Anatolia.
-Added new flags for Basileia Rhomaion and Basileia Elysion.
-The Old Patriarchate event will now happen as soon as you own Constantinople and at least one other province in Greece and are not at war with any country that has a core on it.
-Disabled the vanilla event "Ottomans Cease Paying Tribute".
-Enacting Prince Orhan's Reform now decrease Janissary reinforcement cost by -90% up from -50%.

BUG FIXES:
-The tooltip on Library of Alexandria now correctly states the upgrade requires 7 buildings.
-Fixed a bug where A New Trade Expedition event would trigger repeatedly if the first option was picked.
-Fixed a bug where the PU being broken with Spartania would result in your ruler being replaced.
-Fixed a bug where having tier 3 Elysian Highway Network monument would make every vassal give you 5% Emporoi loyalty.
-Fixed another bug with rebels in The Death of Georgios Gemistos Plethon event
-Fixed a typo in tooltips describing the difference in Manpower Shortage/Settler Heritage modifiers.
-Fixed to various exarch creation and culture integration bugs.
-Fixed a bug that prevented Claim Colonial Region peace deal option to be used in certain cases.

1.24.1.0 Changelog:
CHANGES:
-Updated for eu4 version 1.37.2
-Exarchs now get -2 Unrest and -5 Years of Separatism, plus they will now take humanist ideas as soon as possible.
-Exarchs now get 25% higher liberty desire from development, and 10 baseline liberty desire reduction
-The "Jewel of the Atlantic" and "La Serenissima" modifiers no longer give local ship construction speed and repair speed, as the province now has a Arsenal of Venice monument
-Moved Aegean Archipelago area to Balkan region
-Triumph for Anatolia now requires 5 less provinces, while triumph for Illyrikon and Syria require 5 more
-A Question of Autonomy event can now only happen once.
-Roman/Elysian economic gov. reform province modifiers are now hidden
-Before re-discovering Europe Rhomania's Charter Colonies senate issue is replaced by Expand the Frontier, which does not increase the colonial range
-You now get core upon conquering the selected base of operations and not before

BUG FIXES:
-Fixed a visual bug where tier 3 Alhambra monument didn't specify that the effect will also be given to the overlord if held by an exarch
-Fixed a bug where creating Konstantinia could prevent all culture shock provinces from being integrated
-Fixed a bug where Gateway to Elysium province triggered modifier didn't correctly account for subjects and allies trade power in the Kykladian Isles
-Fixed a bug where "The Death of Georgios Gemistos Plethon" event didn't spawn any rebels
-Fixed a bug where Pekuakamiulnuatsh didn't start with tribal development modifier, which caused other issues like passive culture integration not working
-Fixed a bug where Elysian Marines doctrine didn't have a correct picture
-Fixed some typos

1.24.0.3 Changelog:
CHANGES:
-Varangian Influence modifier no longer reduces income

BUG FIXES:
-Fixed a bug where Trade Expedition mechanic was always available
-Fixed some hellenic disaster related events having wrong text in last option

1.24.0.2 Changelog:
BUG FIXES:
-Fixed a bug where A New World to Explore modifier wasn't removed upon getting a second colonist

1.24.0.1 Changelog:
CHANGES:
-Updated the submods and added a new music track to the music submod

BUG FIXES:
-Fixed a bug where mission preview wasn't working for new mission trees in Winds of Change

1.24.0.0 Changelog:

CHANGES:
-Updated the mod to 1.37.0
-Imperial Protectorates now give their overlord bonus if they own a majority of province trade power in their home node instead of owning 50 provinces.
-The second option of "The Death of Georgios Gemistos Plethon" event now always spawns rebels
-Removed Pyramid of Cheops and Petra monuments. (The Pyramids aren't a part of any living religion at the time, and certain local rulers even attempted to demolish them. Petra has been sadly abandoned and forgotten by the time the game starts and wouldn't come into the spotlight until archaeologists started investigating the region in 19th century.)
-Renamed Anasazi to Tanoa and Navajo to Diné
-Afaq Khoja Mausoleum monument is now exclusive to Muslims


BUG FIXES:
-Fixed a bug on linux that caused confederations to form too fast
-Added missing name for the to_nat_colonise_foreign_modifier modifier
-Roman Renaissance effect outcome is now properly random

1.23.10 Changelog:
CHANGES:
-Selling Morea to Genoa during the flight now adds a Barracks in the capital and 5% Army Professionalism (or 20% Army Tradition if you don't have the dlc) in addition to its previous benefits.
-Buffed modifiers for initial Hellenic pantheon's Zeus
-Bandits Take Advantage of Ongoing Conflicts event now adds 50 devastation instead of 90
-Female Hellenic rulers of Rhomania/Elysia will now be knows as Hiereia Basilissa
-Bolster the Colonial Office Administrative Burden interaction now adds 25 colonial growth

BUG FIXES:
-Fixed a bug where Arsenal Efficiency modifiers weren't applied properly
-Fixed a bug where the trigger for tier 1 Alexandrian Library wouldn't work correctly
-Fixed a bug where the construction on Lakonian highway didn't start when the decision was enacted
-Fixed a bug where in certain circumstances expelling natives that are being integrated wouldn't clear the assimilation interface
-Fixed a bug where merchant estate land share would be set to 5% if you completed The Merchant Class mission while bringing Venetians
-Fixed a bug where Arsenal Efficiency modifiers weren't applied properly
-Fixed a bug where you got a ship by selling more to Genoa instead of Venice
-Fixed several text typos

1.23.9 Changelog:
CHANGES:
-Added Lakonian Highway segment
-Renamed Ivos to Eiros

BUG FIXES:
-Fixed a bug where in certain circumstances Portuguese trade deal wasn't terminated when Portugal got annexed
-Fixed a bug where Theophilos wouldn't lose stats during the Winter Marsh event if the royal ship sunk during the flight, and added a new tooltip explaining why the stats were lost
-Fixed a bug where child levy bonus to Janissary reserve could stay after the law was toggled off

1.23.8 Changelog:
CHANGES:
-Tier 2 of Alexandrian Library now requires 7 buildings instead of 8
-Tier 3 Hippodrome now requires 125.000 troops killed instead of 200.000

BUG FIXES:
-Fixed a bug where Akrotirion trigger tooltip for Elysian Silk objective wasn't displayed properly
-Fixed a bug where "Establish the Exarchate of Megáli Portogalía" decision didn't change the resulting country name and could be taken again
-Gateway to Elysium now requires 4 CoTs in Kykladian Isles and 6 CoTs in Elysian Bay instead of the opposite
-Fixed unit model paths, which were causing invisible unit models on Linux
-Corrected some tooltips referring to old culture assimilation modifiers