Unlockables brought to you by 
Relics
Complete the game once, you'll be able to use these from the beginning of the game.
Crossbow/Assault Rifle
Complete the game once with Blake in your party.
Silenced Weapons
Complete the game once with Warren in your party.
Stealth Movement
Complete the game once with Noah in your party
Survivor Success
Unlock every relic(perk) to unlock this.
Unlimited Ammo
Complete the game once with Swenson in your party.
Item Boost
Complete the game once with Sheila in your party.
Faster Stronger
Complete the game once with Harrison in your party.
Marksman Boost
Complete the game once with Mia in your party
Bigger Clips
Complete the game once with Jane in your party.
Melee Boost