Calling All Cars Unlockables (PS3)

Calling All Cars! is similar to Twisted Metal, though it has been compared by its reviewers to be more akin to NBA Jam[2]. It employs a top-down ¾ perspective and cel-shaded graphics.
The object of the game is to capture escaped convicts while battling against three other bounty hunters, who are also trying to capture the criminals. The game features online multiplayer and split-screen play.

(Wikipedia)

UNLOCKABLES

Bonus vehicles

Complete the indicated task to unlock the corresponding vehicle.

Blue Bomber: With the options set to a single level five minute game under the Captain difficulty setting, win the Trainyards level using only the helicopter to score.
Cherry Picker: With the options set to a single level five minute game under the Chief difficulty setting, win the Burbs level with 20 or more points.
Dumper: Complete Tournament mode under the Sergeant difficulty setting.
Fleabag: Complete Tournament mode under the Chief difficulty setting.
Highroller: With the options set to a single level five minute game under the Captain difficulty setting, win the Burbs level without allowing your opponent to score.
Litter Box: Complete Tournament mode under the Captain difficulty setting.
Shamrock: With the options set to a single level five minute game under the Sergeant difficulty setting, win any level without allowing your opponent to score.
Sweet Cheeks: With the options set to a single level two minute game under the Captain difficulty setting, win any level without allowing your opponent to score.
Yellow Rose: Complete Tournament mode under the Rookie difficulty setting.
Yellowjacket: With the options set to a single level five minute game under the Captain difficulty setting, win the Alpine level using only the 3 point ramp.

Here's a gameplay trailer: