Crimson Sea 2

Play as Bow Rahn in multi-player mode:
Complete the Original Menace mission and reach "S" rank

Play as Diez in multi-player mode:
Complete the Diez, Woman Warrior mission and reach "S" rank

Play as Shami in multi-player mode:
Complete the Princess Shami mission and reach "S" rank

Unlock Fashion Ring:
Finish the game once.

Trainer 2: Finish the Valley Stalker mission and reach "S" rank.
Trainer 1: Finish the Prestsite in Darkness mission and reach "S" rank.
Surge 2: Finish The Menace Hordes mission and reach "S" rank.
Surge 1: Finish The Prototype mission and reach "S" rank.
Siphon 2: Finish the A New Menace mission and reach "S" rank.
Siphon 1: Finish The Stolen IAG Badge mission and reach "S" rank.
Reserve 2: Finish the Soul Of Semplice mission and reach "S" rank.
Replicator: Finish the Crimson Sea mission and reach "S" rank.
NP Converter 2: Finish the Fiery Seguido Base mission and reach "S" rank.
NP Converter 1: Finish the Poisoned Una mission and reach "S" rank.
NP Booster 2: Finish the Rescue Daisy mission and reach "S" rank.
NP Ability: Finish the Remnants Of Times Past mission and reach "S" rank.
HP Booster 2: Finish the Deadly Energy mission and reach "S" rank.
G Ability: Finish the Operation Network mission and reach "S" rank.
B Ability: Finish the A Town In Panic mission and reach "S" rank.
Vipa Suit 2: Finish the Lab at Movindo mission and reach "S" rank.
Vitalizer 1: Finish The Crafty Menace mission and reach "S" rank.
Vitalizer 2: Finish the Battle Of The Minefield mission and reach "S" rank.