Complete the four "Page 1 Quests" surrounding the Metal Gear character. These are as below:

Hide in a Cardboard Box for 10 seconds – Make sure you don't let them see you. Unlocks the Lying in Wait Loading Screen.
Deal 250 damage to opponents within 10 meters – Try to remember some of the basics of CQC. Unlocks the Stun Knife Pickaxe.
Deal 50 damage to opponents with explosives – The sound of the explosive will alert your enemies, so be careful. Unlocks the Solid Profile Spray.
Break 2 security cameras or turrets –A surveillance camera!? Unlocks a ! Banner Icon.
Deal 500 damage to opponents with assault rifles – I don't like to waste bullets. Unlocks the ! Emote.