Collection missions will unlock after meeting specific requirements, such as shooting down 1000 enemies using only a certain Mobile Suit.

Mission	How to unlock
Attacks from All Directions	Play 10 missions in Nu Gundam, Qubeley series, Turn X, Strike Freedom, Reborns Gundam, Sazabi, or Zeong.
Baptism Before God	Shoot down 1000 in The O, Gundam Mk II (Titans) or Hambrabi.
Big Green Battle	Play 10 missions in a green mobile suit.
Black Shock	Play 10 missions in a black mobile suit.
Blue Shock	Play 10 missions in a blue mobile suit.
Crimson Shock	Play 10 missions in a red mobile suit.
Deformed Mobile Suits	Play 10 missions in Zeta Gundam, Wing Gundam, Epyon, Hambrabi, Bound Doc, Gaza C, or Gaza D.
Feet? What Are They Good For?	Play 10 missions in Ball or Zeong.
Fight! King Of Hearts!	Shoot down 1000 in Burning Gundam or Master Gundam.
For The Dialogue That Should Come	Shoot down 1000 in 00 or Reborns Gundam.
Freedom, Justice, and Fate	Shoot down 1000 in Strike Freedom, Infinite Justice, or Destiny.
Heroes Of The One Year War	Shoot down 1000 in Ball or GM.
Marine Mayhem	Play 10 missions in Z'gok series, Acguy, or Kapool.
Mother Space	Shoot down 1000 in Qubeley or Qubeley Mk II.
Pedigree of the White Devil (1)	Shoot down 1000 in Nu Gundam.
The Moon Will Always Be There	Shoot down 1000 in Double X, Turn A, or Turn X.
The Sword Which Disrupts the Age	Shoot down 1000 in Epyon or Tallgeese II.
White Shock	Play 10 missions in a white mobile suit.
Wings That Fly Toward The Future	Shoot down 1000 in Wing Gundam, Deathscythe, or Heavyarms.
Yellow Shock	Play 10 missions in a yellow mobile suit, clear all other color based missions.