On Xbox 360 and PS:
1. Cecily Fairchild: Finish Seabook Arno’s story missions
2. Dozle Zabi: Accept invitation to join Zeon and clear the missions given
3. Four Murasame: Finish Kamille Bidan’s story missions and read the new mail to unlock Four’s friendship mission; clear it
4. Glemy Toto: Agree to help Glemy establish his own faction while joining Axis, and clear the mission given
5. Gym Ghingnham: After joining Dianna Counter, have at least normal relations with Gym and he will send a mail; read and clear the mission given
6. Gyunei Guss: Play as Quess Paraya, and read Gyunei’s mail to unlock his friendship mission; clear it
7. Hayato Kobayashi: Have good relations with Hayato and clear his friendship mission
8. Kai Shiden: Have good relations with Kai and then clear his friendship mission
9. Katejina Loos: Have good relations with Katejina and read her mail to unlock her friendship missions; V2 Gundam license is required to clear them
10. Lacus Clyne: Clear Kira Yamato & Athrun Zala’s story missions, and read Lacus’ mail in Kira’s terminall; clear the mission given
11. Lunamaria Hawke: Clear Shinn Asuka’s story mission and read Lunamaria’s mail; Zaku II CA license is required to clear the mission
12. M’Quve: Read a request mail from Kycillia while joining Zeon and clear the mission given
13. Quess Paraya: Play as a non-Newtype, build up relation with Quess until you receive mail from her, then make the character a Newtype
14. Ramba Ral: Read a request mail from Dozle while joining Zeon and clear the mission given; also need to befriend Ramba Ral first
15. Reccoa Londe: Play as Yazan Gable and shoot down Reccoa in any mission
16. Rosamia Badam: Have best relations with Kamille after joining AEUG, then read his mail and clear the mission given
17. Sarah Zabiarov: Have good relations with Sarah and Scirocco, bad relations with Reccoa, then read Sarah’s mail and clear the mission given
18. Sleggar Law: Play as a female character, have good relations with Sleggar, and then read his mail to unlock his friendship mission; clear it
19. Yazan Gable: Have good relations with Yazan after joining Titans, read his mail and clear the test mission given
On PS2
1. Char’s Z’Gok: Have good relationship with Char and complete his second License Mission (2)
2. Char’s Zaku: Have good relationship with Char and comeplete his first License Mission (1)
3. Destiny Gundam: Beat Shinn’s Story Missions and have good relationship with him then complete his License Mission
4. God Gundam: Have good relationship with Domon and complete his License Mission
5. Gundam: Have good relationship with Amuro and complete both his License Missions (1 and 2)
6. Gundam Epyon: Have good relationship with Milliardo and complete his License Mission
7. Gundam F91: Beat Seabook’s Story Missions and have good relationship with him then complete his License Mission
8. Gundam MK-II AUEG and Titans: Have good relationship with Kamille and beat his License Missions (1 and 2)
9. Gundam Wing Zero: Have good relationship with Heero and complete his License Mission
10. Hyaku Shiki: Have good relationship with Char then complete his License Missions (1 and 2)
11. Infinite Justice Gundam: Beat his story mission and have good relationship then complete License Mission
12. Master Gundam: Have good relationship with TouhouFuhai then complete his License Mission (Must have gotten God Gundam’s license)
13. Musha Gundam: Beat 5000 troops then complete corrosponding Free Mission then beat Free Missions 1 to 6 at the bottom (each unlocked through having the members of th
14. Musha Gundam MK-II: Beat 50 missions then complete corrosponding Free mission then beat Free mission 7 at the bottom then complete his License Mission
15. Nu Gundam: Have gotten all UC Licenses and have very good relationship with Amuro then complete his License Mission
16. Quebeley (Haman): Have good relationship with Haman then complete her License Mission
17. Quebeley (Puru/Puru Two): Have good relationship with both Puru and Puru Two and complete their License Mission
18. Sazabi: Have Char’s Zaku, Char’s Z’Gok and Hyaku Shiki’s licenses and have very good relationship with Char then complete his license missions (1 and 2)
19. Strike Freedom Gundam: Beat Kira’s Story Missions and have good relationship with him then complete his License Mission
20. The O: Have good relationship with Scirocco then complete his License Mission
21. Turn A Gundam: Have good relationship with Loran then complete his License Mission
22. V2 Gundam: Beat Usso’s Story Missions and have good relationship with him then complete his License Mission
23. Z Gundam: Have good relationship with Kamille then complete his License Missions (1 and 2)
24. ZZ Gundam: Have good relationship with Judau and Roux then complete their License Missions (1 and 2)
PS: I got it from Videogamesblogger.com, big credit to this site.
Authors bio is coming up shortly.