Dino Crisis 2 Unlockables and Secrets (PSX)

Dino Crisis 2 is an action game and sequel to Dino Crisis. The game was developed and published by Capcom and was released for the PlayStation on September 13, 2000. The game was followed by another sequel, Dino Crisis 3 which was released in 2003 for the Xbox.

Regina is now on another mission, involving a facility located close to a town called Edward City. A major anomaly has caused the whole island to be transported back in time to the era of the dinosaurs, along with all the human inhabitants. Regina also has a new ally, Dylan, who is playable through half of the game and has a strange connection to the events on the island. The player's character change at specific points in the game. The goal is to rescue any survivors and retrieve data on Third Energy.
(Wikipedia)

Unlockables

Different Backgrounds at Ranking Screen
Alternate loading screens. The first time you clear the game you will have a picture of Dylan, the second time you will see Regina and the third time you will see Paula. Clear the game multiple times.

Misc. Unlockables
Dino Coliseum - Beat the game one time.

Infinite Ammo - Beat the game and get all 11 Dino Files.

Unlockables 2

Obtain the amount of money listed to receive the corresponding dinosaur for Coliseum or Dino Duel.

Allosaurus - 180,000 Extinct Points

Compy - 250,000 Extinct Points

Gail - 100,000 Extinct Points

Inostrancevia - 160,000 Extinct Points

Oviraptor - 150,000 Extinct Points

Rick - 100,000 Extinct Points

T. Rex - 150,000 Extinct Points

Tank - 120,000 Extinct Points

Triceratops - 200,000 Extinct Points

Velociraptor - 150,000 Extinct Points

Secrets

Extra Dinosaurs
Choose Rick, Gail and the tank in the Extra Crisis games to be able to choose from more dinosaurs in the character selection screen for Dino Duel. Choose all characters and dinosaurs for the Dino Coliseum and Dino Duel to get Triceratops and Compsagnathus.

Ultra Raptors
To unlock a fight with a pair of blue Ultra-Raptors, simply kill 20 velociraptors in secession without getting hit. If you pull off a combo of 20, in the next raptor infested area, two Ultra Raptors will be waiting there for you.

Here's the ending video of the game: