01 - After dodging the guards and climbig a bit you'll go over a concrete pipe and see the first collectable on a table.

02 - After the first one, climb the boxes and it's to your right at the top above some drawers.

03 - Present Time - After learning how to travel through time and dodging your first guard you'll come to a corridor with two more. Go left and it's above a table that looks like some kind of reception desk.

04 - Past Time - Next room in front of the desk is a cafeteria: it's above one of the tables in the middle of the room.

05 - Past Time - After using the injection, go back to the previous room to find a vent you can go into. In the restroom at the end you'll find it on the floor.

06 - Past Time - On a catwalk bellow the fourth giant fan.

07 - Past Time - After you do the giant jump you'll go through two sets of doors and it's right in front of you.

08 - Present Time - Start the level in the Past Time, go left past the doors and it's right there on top of a computer.

09 - Present Time - Really close to the next one, on the floor before going down some stairs.

10 - Past Time - After getting the data from the server and going through a duct it's on the reception desk in front of you.

11 - Past Time - After Getting to the floor and killing all the enemies, it's on the left side room on top of some stairs.

12 - Past Time - Same thing, but on the right side.

13 - Past Time - On the computer in the first room.

14 - Past Time - On the room with an acid pool after the fire traps, you can enter through a broken window in the Present Time above where the acid pool is.

15 - Present Time - After the first room you'll get to a kind of office area. There's a ventilation duct you can enter here to get this one at the end.

16 - Past Time - Jump inside the broken vent in the ceiling while on the present. Once inside, change to the past to make the vent whole again and go to the end to find this one on the floor. (Found by Sangriaz)

17 - Present Time - As soon as you exit the ventilation duct, it's inside the door to your left.

18 - Past Time - After jumping to a hole in the wall, it's in there, before you fall down.

19 -Present Time - In the next room, go all the way to the top and it's inside one of the cells on the left side.

20 - Present Time - On the other side of the room with the generator.

21 - Past Time - First room, behind a fence to your right.

22 - Present Time - After pressing the button to open the cells, go back and enter the fourth cell after the one with the prisoner you talked to. There's a duct here with the secret at the end.

23 - Past Time - You'll go through an office room and then another room with lots of lockers. It's inside an open one at the end.

24 - Present Time - Next room, on the desk.

25 - Past Time - When you come to a room with a big fan you have to pass through, instead go to the other side through the door.

26 - Present Time - Right after the last one, after you pass the fan, turn to your right and drop down bellow an air vent to find this one. (Found by Sangriaz)

27 - Past Time - After the scene where they are dragging your friend, inside a cell where they came from in the scene.

None

28 - Present Time - Right at the start of the level on the left centre of the large room above some boxes. This is the room where you meet the tank and activate the first computer in the level. (Found by The Dauntless)

29 - Past Time - After going down an elevator, in front of you after the door.

30 - Present Time - inside a broken ventilation duct on the floor bellow the hole in the wall you have to jump through.

31 - Present Time - After jumping through the hole I just mentioned, on your right.

32 -Past Time After going down the first elevator it's in the middle of this room where you fight a lot of enemies, on the ground close to some rocks.

33 - Present Time - After going down the second elevator, go through both doors and it's in front of you, on the other side of the hole one floor bellow.

34 - Past Time - After turning off the lasers for the girl, in the next room on the floor.

35 - Past Time - First Room, on top of a computer on the right side across the room.

36 - Close to the other one, but instead of going all the way across the room, it's in a computer in the middle.