Super Robot Taisen Original Generation [GBA]

Unlock Shishio Blade
Make sure your main character has at least 50 kills by stage 26. Destroy Zengar on stage 26. Be on Hard Difficulty.

Unlock Graviton Launcher
Make sure your opposite main character (Ryusei or Kyosuke) has at least at least 55 kills by stage 32.

Unlock Hero Symbol
Daitetsu (Ryusei Route) or Lefina (Kyosuke Route) must be at least level 35 by stage 35.

Unlock Soul of Metal
Daitetsu (Kyosuke Route) or Lefina (Ryusei Route) must be at least level 38 by level 38.

Unlock Keep the ability to combine into SRX
Take the Ryusei Route.

Unlock Valcion Kai
On stage 28, reduce the HP of the Valcion Kai below 10% without destroying it.

Unlock R-GUN
Destroy it on stage 30.

Unlock Lion-F
Take the Ryusei Path.

Unlock Guarlion
Destroy it with either Task or Rai on stage 24.

Unlock Huckebein 008L
Have Ingram be at level 32 before stage 30 (Ryusei Route) or Villeta at level 23 by stage 19 on the Kyosuke route.

Unlock Grungust
Destroy the R-GUN on stage 30 on Kyosuke's path without getting the Huckebein 008L.

Unlock Gespenst-S
Destroy the R-GUN on stage 30 on Ryusei's path without getting the Huckebein 008L.

Unlock Gespenst-R
On the Kyosuke Route, make sure Guilliam is at least level 23 by stage 19.

Unlock Kai
Take the Kyosuke Route.