GAC Armour Complete the game on OFFICER difficulty.
GAC Helmet Get 30 headshots in any level on OFFICER difficulty or higher.
GCPD Shirt (Available in Multiple Colours) Complete any level (excluding the Prologue) without firing a shot.
Jack and Shadow Shirt (Available in Multiple Colours) Combine Jack and Shadow to kill 20 enemies in any level on OFFICER or greater difficulty.
Logo Shirt (Available in Multiple Colours) Complete the Protect the Innocent Achievement.