Portal 2 Shirt:
Complete Portal 2 Co-op
Love Shirt:
Hug 3 friends in Portal 2 Co-op.
Companion Cube:
Complete Portal 2 Single-Player.
Portal 2 Hat:
Survive the manual override.
Turret Shirt:
Complete Test Chamber 10 in under 70 seconds.
Unlock Bionic Beanie:
Complete 'Lunacy'.
Unlock WCC Flag:
Complete 'High Five'.