Mass Effect 2
62 Achievements
1,355
55-70h
Friend or Foe
Obtain geth technology
10
How to unlock the Friend or Foe achievement in Mass Effect 2 - Definitive Guide
Note:- There may be other ways to get this achievement, and it may not matter what you say during the discussion but this way worked for me
Story related. If you want more info, continue reading. Otherwise, know that this will unlock through the natural progression of the story.
If you don't have Brawler yet, then this is the mission where you'll have an excellent chance of completing it.
After completing the mission on the Collector ship, the Illusive Man will give you the coordinates of a derelict Reaper to get an IFF (Identify Friend/Foe). When you arrive, the ship will appear to be abandoned. At least until you reach the husks. Lots and lots and lots and lots of husks. If you can’t get Brawler by the end of this mission, then you haven’t really been trying. You’ll spend a vast majority of your mission fighting through waves and waves of husks, abominations, and scions. On the lowest level of the ship, you’ll pick up the IFF and then you’ll have to destroy the power core of the Reaper. When the core is open, fire your heavy weapons at it. When the core is shielded, run around and kill as many as husks as you can. There will be plenty of them coming from all sides. Once the core is destroyed, if you decide to take it with you, you will obtain a crew member, Legion and escape the ship just in time.
Once on the Normandy, decide to activate Legion. Don't sell it to Cerberus or anything other than keeping it on the Normandy. Head for the AI Core (through medical on the third level of the ship) and activate it.
At the end of the mission on the Reaper to collect the IFF, you will meet Legion and will have the option of giving him to Cerberus or taking him back onto the Normandy. Take him back to the Normandy and the achievement will unlock. He will be in the A.I. Core behind the Medical Bay.
If you don't have Brawler yet, then this is the mission where you'll have an excellent chance of completing it.
After completing the mission on the Collector ship, the Illusive Man will give you the coordinates of a derelict Reaper to get an IFF (Identify Friend/Foe). When you arrive, the ship will appear to be abandoned. At least until you reach the husks. Lots and lots and lots and lots of husks. If you can’t get Brawler by the end of this mission, then you haven’t really been trying. You’ll spend a vast majority of your mission fighting through waves and waves of husks, abominations, and scions. On the lowest level of the ship, you’ll pick up the IFF and then you’ll have to destroy the power core of the Reaper. When the core is open, fire your heavy weapons at it. When the core is shielded, run around and kill as many as husks as you can. There will be plenty of them coming from all sides. Once the core is destroyed, if you decide to take it with you, you will obtain a crew member, Legion and escape the ship just in time.
Back on the Normandy, decide to activate Legion. Don't sell it to Cerberus or anything other than keeping it on the Normandy. Head for the AI Core (through medical on the third level of the ship) and activate it.
At the end of the mission on the Reaper to collect the IFF, you will meet Legion and will have the option of giving him to Cerberus or taking him back onto the Normandy. Take him back to the Normandy and the achievement will unlock. He will be in the A.I. Core behind the Medical Bay.
To receive the trophy, at the end of the conversation you must select the “Talk to Geth” answer. If you select the “Give to Cerberus” option, then the geth bottle has been explored, you won’t be able to talk to him and there will be no this trophy, as well as the A House Divided / Together We Are Strength trophy
PS Phrases in the dialogue are from memory, the text may differ, but the meaning is the same.