Dragon Ball Z Budokai HD Collection

This is a basic run-down of Vegeta's Dragon Universe

(To unlock Vegeta you must defeat Vegeta with Goku during Goku's Dragon Universe)

Earth (Saiyan Saga)

1) Korin's Tower - Cutscene
2) Kame House - Cutscene with Bulma
3) Red Marker - Cutscene with Krillin, Gohan and Nappa
4) Plains (C2R1) - Cutscene
5) Mountains (C3R3) - Cutscene with Nappa and Goku. You will then fight Goku.
6) Mountains (C3R3) - Cutscene with Yajirobe and Goku.
7) Plains (C3R2) - Cutscene with Gohan and Krillin.
8) Red Marker (Mountains) - Cutscene. Then you will fight Kid Gohan to end the Saiyan Saga

Namek (Frieza Saga)

1) C3R2 - Cutscene
2) C2R2 - Cutscene with Dudoria. You will gain the Final Impact capsule
3) C4R1 - Here you will fight Recoome
4) Frieza's Spaceship - Cutscene
5) Island near Frieza's Spaceship - Here you will fight Frieza in his first form
6) C1R3 - Here you end the Frieza Saga with a fight against Frieza in his final form

Earth (Android Saga)

1) Goku's House - Cutscene. You will gain the Vaccine capsule
2) West City - Cutscene with Bulma. You will gain the Final Flash capsule
3) Plains (C2R1) - Cutscene with Launch
4) Korin's Tower - Cutscene with Korin
5) Desert (C1R3) - Cutscene with Tien and Chiaotzu
6) Mountains (C3R1) - Here you will fight Android #17 and then you will fight Android #18
7) Kami's Lookout - You will gain 2 levels!
8) Mountains (C1R3) - Cutscene with Future Trunks
9) Kame House - Cutscene with Bulma
10) Plains (C3R4) - Here you will fight Cell after he has absorbed Android #17
11) Red Marker - Here you will end the Android Saga with a fight against Cell in his final form

Earth (Buu Saga)

1) World Tournament - Cutscene with Babidi
2) West City - Another cutscene with Babidi
3) Forest (C1R2) - Cutscene with Supreme Kai
4) Plains (C2R2) - Here you will fight Goku
5) Plains (C1R3) - Here you will fight Majin Buu. Afterwards you will unlock Kid Trunks
6) Plains (C1R2) - You will gain the Vegito capsule. Here you will fight Super Buu after he has absorbed Gohan. After some cutscenes you will now be fighting Super Buu.

Supreme Kai's World (Buu Saga

1) Here you will fight the boss of Vegeta's Dragon Universe! Kid Buu!!!!! Once you have won the fight you will win the acheivement