Mass Effect Legendary Edition

Since I didn't to get this in my initial Paragon runthrough, even though I felt like I had done enough sidequests and quests (around 60 total), here is the list that unlocked it for me (note I did not go to Virmire yet or start the Asteroid X57 missions) so I recommend you do as many assignments as you can before going to Virmire. Also, it isn't clear what counts as a "failed" mission so I recommend doing this with Charm and Intimidate so you can make a mix of Renegade and Paragon decisions if necessary to complete the entire mission (e.g. for smuggling in Noveria, saying no probably completes the quest in the log but might not count for the achievement). As the other guides mention, do as many Citadel and Feros sidequests since you need to go there anyways and follow this guide if necessary (https://www.ign.com/wikis/mass-effect/Side_Quests). Make sure you check which sidequests you can do after finishing one or two main planets.

I started a new campaign from scratch on casual, here is the list in case it helps you get close to what you need. If you miss any look up the list and see if you can do another one that fills in the list:

Missions (15):

- Citadel: Expose Saren
- Citadel: Garrus
- Citadel: Wrex
- Feros: Colony Saved
- Find Liara T'Soni
- Noveria: Contamination
- Noveria: Leave Port Hanshan
- Noveria: Lorik Qui'in
- Noveria: Matriarch Benezia
- Noveria: Peak 15
- Noveria: Reactor Repair
- Noveria: Reconnect Landlines
- Noveria: Rift Station
- Noveria: The Hot Labs
- Prologue: Find the Beacon

Assignments (41):

- Asari Diplomacy
- Citadel: Asari Consort
- Citadel: Doctor Michel is Safe
- Citadel: Family Matter
- Citadel: Homecoming
- Citadel: Jahleed Arrested
- Citadel: Planting a Bug
- Citadel: Presidium Prophet
- Citadel: Reporter's Request
- Citadel: Rita's Sister is Safe
- Citadel: Schells has his Data
- Citadel: Signal Tracking
- Citadel: The Fan
- Citadel: The Fourth Estate
- Citadel: Xeltan Convinced
- Feros: Data Recovery
- Feros: Geth in the Tunnels
- Feros: Power Cells
- Feros: Varren Meat
- Feros: Water Restoration
- Noveria: Espionage
- Noveria: Smuggling
- Tali's Pilgrimage
- UNC: Cerberus
- UNC: Colony of the Dead
- UNC: Dead Scientists
- UNC: Derelict Freighter
- UNC: Distress Call
- UNC: Espionage Probe
- UNC: ExoGeni Facility
- UNC: Geth Incursions
- UNC: Hades' Dog
- UNC: Hostage
- UNC: Listening Post Alpha
- UNC: Listening Post Theta
- UNC: Lost Frieghter
- UNC: Major Kyle
- UNC: Missing Marines
- UNC: Missing Survey Team
- UNC: Privateers
- UNC: Rogue VI

This achievement is reminsicent of the original game's achievements where you have to complete a certain number of quests with each character. It popped for me just prior to the final boss, with 18 missions and 37 assignments complete, so completing 55 quests constitutes "the majority of the game".

There's about 60 assignments, oginally the game way back had about 73 total missions. including dlc bring down the sky + 3 missions , minus the og pinicle station dlc not included in this game.

For me this popped at 46 assignments and 16 main missions , where Noveria + side missions were completed, Feros + side missions were completed. Know I haven't started Virmire Nor Bring down the sky Dlc mission. I believe each main mission and dlc carry heavier percentage of completing the majority of the game.
Ex. Like completing Virmire = 15% of the game , while 5 side missions = 5% , so I'd you complete probably half of the side missions like 28 of them, then complete the main missions, side missions within the main mission (Feros has 4 side missions during the playthrough) +dlc then that will count towards the majority of the game. I played the original too many times.

Good luck , its grindy but fun to do at least once, so you know more about the world of mass effect. This is my third time , 2x in the original version and once now and hopefully my last unless mass effect 1 gets a remake 15 years from now.

I unlocked this before Virmire, with 16 missions and 28 assignments. Including 'Bring down the sky' DLC

Here's a great guide I used from IGN - https://www.ign.com/wikis/mass-effect/Side_Quests
It also shows where to find certain assignments.

My best advice would be try and stick to the citadel ones, they tend to be quicker to complete. And do the side assignments linked to a story mission.

On the main missions, sometimes instead of going in guns blazing to get part of the story finished is to do the assignments that take place while doing the main mission, so for example, In feros I turned on all the water pumps, killed the alpha and got some data for a scientist. They are relatively quick to do and you mostly run into them anyway while concentrating on the main mission. Just remember to turn them in when you have done the additional missions to the main mission.

This achievement is much easier to obtain than the original. It’s possible to unlock early in the Noveria sequence before reaching Peak 15 if you do Feros and every possible assignment (but not Virmire or Bring Down the Sky). I have a ton of missions and assignments left undone (that unlock only after Noveria).

This is a handy guide for assignments: https://www.rpgsite.net/feature/11134-mass-effect-assignment...

This achievement bugged out on my first playthrough so I had to do another playthrough of the game for it to unlock. I've seen that various people have also had this quest bug, so I'm just posting this to show what quests I have done, just in case one of these will get the achievement for you.
WARNING: MAJOR SPOILERS
55 Quests in general were completed;

Missions [6]:
Prologue: Find the Beacon
Citadel: Expose Saren
Citadel: Garrus
Citadel: Wrex
Find Liara T'Soni
Ferros: Colony Saved [Note all Colonists were saved, and in my first playthrough this was failed]

Assignments [49]:
UNC: Distress Call
Citadel: Scan the Keepers [All 20 were scanned]
Citadel: Xeltan Convinced [Convinced him to stop his petition]
Citadel: Asari Consort [Septimus has apologised and Sha'ira gifted a 'oddly shaped trinket']
Citadel: Presidium Prophet [Intimidation option on the Hanar was selected]
Citadel: Reporter's Request [Gave the Information found in Fist's hideout]
Citadel: The Fan [Got to the 3rd meting then chose Renegade Option]
Citadel: Jahleed and Chorban [Decided to continue doing the Scan the Keepers Quest]
Citadel: Homecoming [Gave his wife's body back to him]
UNC: Major Kyle [Convinced Kyle to peacefully come back to the citadel for trial]
UNC: Missing Survey Team
UNC: Hostage [Convinced the Biotics to surrender peacefully]
Citadel: Rita's Sister is Safe [Jenna doesn't work for C-Sec anymore]
Citadel: Signal Tracking [Destroyed the AI]
UNC: Hostile Takeover [Eliminated two of the gangs and convinced Helena to disband the gang]
UNC: Privateers [Told Garoth his brother died]
Citadel: Schells has his Data [Ran the scans on the machines and gave the machine back to him]
UNC: Survey is Complete [All materials were gathered, as of the achievement popping]
(Light Metals 28/20, Heavy Metals 27/20, Rare Earths 29/20, Gases 10/6)
UNC: Missing Marines [Informed the Admiral of the fate of his men]
UNC: Entire Collection Found [All Medallions and ID Tags were recovered]
UNC: Collection Complete [Asari Writing 15/10]
Asari Diplomacy [Was added to the Armali Council client list, used the Renegade option for the reward]
UNC: Collection Complete [Turian Emblem 16/13]
UNC: Lost Freighter [Killed the girlfriend and shut off his life suport]
UNC: Rogue AI [The rogue AI was destroyed]
Garrus: Dr Saleon is Dead [Convinced Garrus to kill Dr Saleon]
Wrex: Family Armour [Gave the Armour to Wrex]
UNC: Espionage Probe [Killed Haliat]
UNC: Lost Module [Intel was relayed to Alliance Command]
UNC: Geth Incursions [All the geth bases were destroyed]
UNC: Besieged Bases [Eliminated all the biotic fanatics]
Tali's Pilgrimage [Gave her a copy of the data]
UNC: Dead Scientists [Killed the scientist so Toombs wouldn't]
X57: Bring Down the Sky [The batarian leader killed the humans and I left him for the Alliance officials]
X57: Missing Engineers [Found all 3 of them]
X57: Avoid the Blasting Caps
Citadel: I Remember Me [Jumped Talitha with the sedative]
Citadel: The Fourth Estate [Agreed to the Interview, didn't cut the Interview short]
Citadel: Family Matter [Convinced Rebekah to get the gene therapy]
Citadel: Planting a Bug [Planted the Bug and told her that I successfully did so]
Ferros: Geth in the Tunnels [Destroyed the transmitter]
Ferros: Vareen Meat [Killed the Alpha]
Ferros: Power Cells [Recovered the power cells]
Ferros: Water Restoration [Successfully restored the water, note didn't do this in the first playthrough]
Ferros: Data Recovery [Recovered the data]
UNC: ExoGeni Facility [Killed the creepers and made sure the ones responsible paid the price]
UNC: Derelict Freighter
Citadel: Doctor Michel is Safe [Put a stop to the Blackmail with Renegade option]
Noveria: Smuggling [You gave Opold the package, this was the quest I did]

Good luck with the achievement.