Mission 6 - Vengeance
Collectible #29 - Damaged Optical Camo Cloak
As soon as the mission begins, turn left and head down the alleyway. Turn left and you’ll see a Damaged Optical Camo Cloak lying near a lit doorway.
Collectible #30 - Bio-Luminescent Orchid
In the large compound with the pond in the middle, take out all the guards first (ignore the drones). When the coast is clear, head into the compound from the right-hand entrance (from the direction you begin this area). Keep to the left and move through four different sections of the compound. When you reach the fourth, turn right and you’ll see a Bio-Luminescent Orchid in the shadows.
Collectible #31 - HCXD Bomb Sniffer Robot
After your dust-up with snipers, the regular 54i soldiers and the AVC robot, head through the giant rectangular hole in the wall left by the giant ‘bot. Turn left and you’ll see a HCXD Bomb Sniffer Robot on the floor.
Collectible #32 - Dragon Necklace
After entering the burning facility, head up two flights of stairs, blasting robots as you go. At the top, head through the hole in the wall to your right. There’s another hole in a wall to your left. Destroy the robots inside and head to the right-hand side of the room. You’ll find a Dragon Necklace on a table next to an armchair.