CheatOgre.com: Blood Wake

Gunshark gunboat:
Successfully complete the "Ships In The Night" level under the ensign difficulty setting.

Jackal Devil boat:
Successfully complete the "Assault On Black Moon" level under the ensign difficulty setting.

Lightning speedboat:
Successfully complete the "A Friend In Need" level under the ensign difficulty setting.

Pike speedboat:
Successfully complete the "Payment Is Due" level under the ensign difficulty setting.

Salamander speedboat:
Successfully complete the "Fish In A Barrel" level under the ensign difficulty setting.

Switchblade hydroplane:
Successfully complete the "Gladiator" level under the ensign difficulty setting.

Guncat catamaran:
Successfully complete the "Protection Racket" level under the ensign difficulty setting.

Tigershark gunboat:
Successfully complete the "Sampan Surprise" level under the ensign difficulty setting.

Clanbake Battle mode:
Successfully complete the "A Poke In The Eye" level under the ensign difficulty setting.

Kingdom Come Battle mode:
Successfully complete all levels in the "Baptism of Fire" act under the ensign difficulty setting.

Metal Massacre Battle mode:
Successfully complete the "Hurricane Of Fire" level under the ensign difficulty setting