<youtube>https://www.youtube.com/watch?v=JWAmuDCJtjM</youtube>

There are 7 allies that you must recruit for the Full Crew. After doing the main quests in Kaer Morhen (towards the end of the story) you will receive a main mission called "The Isle of Mists" and 4 other "Brothers in Arms" quests. That's when you are supposed to recruit people for your upcoming battle in Kaer Morhen. You must play a series of lengthy side quests and subplots to recruit everyone, which is going to take several hours. Keira Metz and Triss can be recruited before reaching this point in the game and are the easiest to miss.

You need to recruit the following Allies:
+ Keira Metz (0:05, Velen, send her to Kaer Morhen at the end of her subplot instead of killing her. Her subplot consists of the side quest "An Invitation from Keira Metz", "A Towerful of Mice", "A Favor for a Friend", "For the Advancement of Learning".)
+ Triss Merigold (2:08, Novigrad, complete her subplot. It starts with the side quest "A Matter of Life and Death" and ends with "Now or Never". During Now or Never you must choose during the dialogue at the harbor that you want her to stay and that you love her. She will then go to Kaer Morhen automatically after a cutscene)
+ Roche (3:52, Novigrad, complete side quest "An Eye for an Eye", then talk to Roche during Main Story Mission "Brothers in Arms: Novigrad" and he will come to Kaer Morhen)
+ Ves (3:52, Novigrad, complete side quest "An Eye for an Eye", then talk to Roche during Main Story Mission "Brothers in Arms: Novigrad" and he will bring Ves with him)
+ Zoltan Chivay (5:05, Novigrad, simply talk to him during Main Story Mission "Brothers in Arms: Novigrad")
+ Ermion (5:35, Skellige, simply talk to him during Main Story Mission "Brothers in Arms: Skellige")
+ Hjalmar (6:08, Skellige, complete the subplot about choosing Skellige's ruler for the Kingmaker trophy. The subplot consists of the side quests "Possession", "The Lord of Undvik", "King's Gambit". During King's Gambit you must choose to help either Hjalmar or Cerys, doesn't matter which one. Then talk to them once they are ruler and Hjalmar will come with you.)


There are other characters you can talk to during the Brothers in Arms quests. Also some that can be recruited from side quests, but they are optional and have no impact on the trophy or achievement. It doesn't matter if they die or whether you talk to them or not. Feel free to skip them all. Cerys an Craite is only important if she becomes ruler of Skellige, then you must talk to her.

These characters are NOT needed.
- Emperor Emhyr Var Emreis (Royal Palace of Vizima)
- Letho (Velen)
- Sigismund Dijkstra (Novigrad)
- Folan (Skellige, during side quest "The Lord of Undvik")
- Vigi (Skellige, during side quest "The Lord of Undvik")
- Crach an Craite (Skellige)
- Cerys an Craite (Skellige, should she become ruler of Skellige you need to talk to her and she will send Hjalmar to Kaer Morhen)


THINGS THAT COULD GO WRONG / WHAT IS MISSABLE:
- You could end up killing Keira Metz if you make wrong dialogue choices at the end of her subplot
- Triss Merigold will sail away and never return if you don't tell her to stay and that you love her at the end of her subplot
- If you choose the third dialogue choice during the King's Gambit quest of the Kingmaker subplot you will walk away and neither Hjalmar, nor Cerys will become ruler. Then Hjalmar cannot be recruited anymore.
- You could ignore the Brothers in Arms story quests entirely and go directly to the Isle of Mists, thus missing all possible allies