Hi,
This topic serves as a content chronicle of Generation Zero. So, both the old and new players can see what developers have been up to all this time. 
Below are listed all the new content updates for the game. Further info about each update can be read via the included patch notes link.
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26th of March '19 - Game’s launch.
Announcement: Launch Trailer Out Now | Generation Zero -
17th of April '19 - Stamina bar, new emotes + bug fixes.
Patch notes: April Game Update Now Live | Generation Zero -
28th of May '19 - Revamp of Archipelago region, photo mode + bug fixes.
Patch notes: May Update Now Live | Generation Zero -
11th of June '19 - Tubular Vanity Pack DLC.
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25th of June '19 - Bikes, machine loot + bug fixes.
Patch notes: June Update Now Live | Generation Zero -
2nd of July '19 - Schweet Vanity Pack DLC.
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26th of August '19 - Plundra (storage box) + bug fixes.
Patch notes: August Update Patch Notes | Generation Zero -
24th of September '19 - Blockbuster Vanity Pack DLC.
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24th of September '19 - Challenges + bug fixes.
Patch notes: September Update Now Live | Generation Zero -
25th of October '19 - Rivals, experimental weapons, new emotes + bug fixes.
Patch notes: October Update Patch Notes | Generation Zero -
29th of October '19 - Halloween event.
Announcement: Redirecting... -
25th of November '19 - Alpine Unrest DLC, LMGs, Apocalypse class machines + bug fixes.
Patch notes: Alpine Unrest Update Notes | Generation Zero -
20th of December '19 - Holiday event.
Announcement: Happy Holidays From the Team | Generation Zero -
28th of January '20 - Tweaks to the experimental weapon drops + bug fixes.
Patch notes: January Update - Now Live! | Generation Zero -
24th of February '20 - Holiday event (Semla), challenges for Alpine Unrest DLC + bug fixes.
Patch notes: February Update - Patch Notes | Generation Zero -
23rd of March '20 - Crafting, new inventory, 2nd revamp of Archipelago region, adjustable difficulty, new experimental LMG + bug fixes.
Patch notes: March Update - Patch Notes | Generation Zero -
26th of March '20 - 1 year celebration event.
Announcement: Redirecting... -
27th of April '20 - Harvester can call in Hunter pod airdrops + additional tweaks (e.g more carry capacity, can’t jog when over encumbered) + bug fixes.
Patch notes: April Update - Patch Notes | Generation Zero -
5th of June '20 - National Day event.
Announcement: Redirecting... -
22nd of June '20 - For PCs only: FNIX Rising DLC, revamp of South Coast region and partial revamp of Farmlands region, addition of Apocalypse Harvester, melee weapons + bug fixes.
Patch notes: FNIX Rising - Patch Notes | Generation Zero -
25th of August '20 - For Xbox only: FNIX Rising DLC, revamp of South Coast region and partial revamp of Farmlands region, addition of Apocalypse Harvester, melee weapons + bug fixes.
Dev letter: News from the Team - August 21st | Generation Zero
Announcement: Redirecting... -
30th of October '20 - Halloween event.
Announcement: Redirecting... -
5th of November '20 - New class of Rival, ammo and first aid kit crafting, partial revamp of Farmlands region (middle part), experimental melee weapon + bug fixes.
For PS4 only: FNIX Rising DLC, revamp of South Coast region and partial revamp of Farmlands region, addition of Apocalypse Harvester, melee weapons + bug fixes.
Patch notes: November Update - Patch Notes | Generation Zero -
9th of December '20 - Partial revamp of Farmlands region (North-West part), directional signs in bunkers, inventory sorting by item quality + bug fixes.
Patch notes: December Update - Patch Notes | Generation Zero -
17th of December '20 - U.S. Weapons DLC.
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16th of February '21 - Final revamp of Farmlands region (North-East part), addition of Apex Connect for daily assignments + bug fixes.
Patch notes: February Update - Patch Notes | Generation Zero -
4th of May '21 - PC & PS4 only: Revamp of Forest region, base building + bug fixes.
Patch notes: May Update - Patch Notes | Generation Zero -
4th of May '21 - PC & PS4 only: Soviet Weapons DLC.
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29th of November '21 - Cross-play between Xbox and Windows 10, including voice chat. Xbox only: Revamp of Forest region, base building, Soviet Weapons DLC + bug fixes.
Patch notes: Xbox Resistance Update Patch Notes | Generation Zero -
7th of February '22 - Two new Soviet faction machines (LYNX and Wolf), final revamp of Forest region (South-West part), partial revamp of Marshlands, weapon wheel, Plundra and Recycling Station capacity upgrades, some new base modules + bug fixes.
Patch notes: The Landfall Update - Patch Notes | Generation Zero -
7th of February '22 - The Base Defense Pack DLC.
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22nd of February '22 - Hotfix to Landfall update.
Patch notes: The Landfall Update - Hotfix | Generation Zero -
8th of March '22 - US Weapons Pack 2 DLC.
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28th of March '22 - 3rd Anniversary event.
Announcement: Redirecting... -
7th of April '22 - Revamp of Marshlands region, base assault mode (in Forest region), inventory filtering, Soviet base modules for player base + bug fixes.
Patch notes: Base Assault Update - Patch Notes | Generation Zero
And that is it, as of writing this chronicle. Once the new updates are released, chronicle will be updated as well…
–
Aesyle