@razz077 This is what i found so far in my list. I turned it into a list and made it easy, so I want your friends list to see what is missing!
From Ashes
Release Date: March 6, 2012 (Launch Day DLC)
Description: Introduces the Prothean squadmate, Javik, and a mission on Eden Prime. Also includes new weapons and squadmate conversations.
Availability: Standalone or bundled with the Collector's Edition.
Resurgence Pack (Free Multiplayer DLC)
Release Date: April 10, 2012
Description: Adds two new maps (Firebase Condor and Firebase Hydra), six new characters (e.g., Geth Engineer, Krogan Vanguard), and new weapons.
Rebellion Pack (Free Multiplayer DLC)
Release Date: May 29, 2012
Description: Adds two new maps (Firebase Jade and Firebase Goddess), new characters (Vorcha and Ex-Cerberus), new weapons, and a new objective type (Retrieve).
Extended Cut
Release Date: June 26, 2012
Description: Expands on the game's controversial ending with additional cinematics and epilogues.
Availability: Free for all players.
Earth Pack (Free Multiplayer DLC)
Release Date: July 17, 2012
Description: Adds three Earth-themed maps (Firebase Rio, Firebase London, Firebase Vancouver), new characters (e.g., N7 Slayer, Demolisher, Paladin), and new weapons.
Firefight Pack
Release Date: August 7, 2012
Description: Add seven new weapons to the single-player campaign, including the Indra sniper rifle and Reegar Carbine.
Leviathan
Release Date: August 28, 2012
Description: Explores the origins of the Reapers and adds new locations, characters, and lore.
Availability: Paid DLC.
Retaliation Pack (Free Multiplayer DLC)
Release Date: October 9, 2012
Description: Adds hazard versions of existing maps, new playable enemies (e.g., Collectors), six new characters (e.g., Turian Havoc, Volus Adept), and new weapons.
Omega
Release Date: November 27, 2012
Description: A story-driven expansion where you help Aria T'Loak reclaim Omega from Cerberus. Adds new missions, characters, and weapons.
Availability: Paid DLC.
Alternate Appearance Pack 1
Release Date: November 27, 2012
Description: Add new costumes for squadmates (Garrus, Liara, and EDI).
Availability: Paid DLC.
Groundside Resistance Pack
Release Date: October 16, 2012
Description: Adds six new weapons to the single-player campaign, including the M-11 Suppressor and Venom Shotgun.
Availability: Paid DLC.
Reckoning Pack (Free Multiplayer DLC)
Release Date: February 26, 2013
Description: Adds new characters (e.g., Alliance Infiltration Unit, Krogan Warlord), new weapons, and new gear upgrades for multiplayer.
Citadel
Release Date: March 5, 2013
Description: A fan-favorite expansion, featuring a personal and nostalgic story with the Normandy crew. Includes a large apartment, squadmate interactions, a party, and bonus combat missions.
Availability: Paid DLC.
Special Editions/Bundles
Collector’s Edition Content (Included with CE or Digital Deluxe Edition)
N7 Arsenal Pack (extra weapons: N7 Pistol, SMG, Shotgun, and Sniper Rifle).
Appearance customization for Shepard.
Robotic Dog (for the Normandy).
Soundtrack, art book, and in-game bonuses.
Mass Effect 3 Deluxe Edition (Digital Deluxe Edition)
Includes all Collector's Edition content plus the From Ashes DLC.