Styx: Shards of Darkness

Obviously this can be obtained over the course of the game by simply playing it, but if you're eager to get it out of the way, this can be obtained (or you'll get significant progress toward it) at the end of the 2nd Mission, Korrangar.

During this level, you'll be given a side quest to open an Amber storage vault.

Over the course of both sections of the mission, you'll need to find 5 tiles that are hidden in various rooms to be able to open the vault. Look for doors that have a white circular mat in front of them. In Amber Vision these mats display an arrow pointing toward the door. Inside will be 1 of 5 tiles and, obviously, an enemy or two. There are 3 tiles in the first section, and 2 in the second. The second half starts when you reach the balcony, so make sure you have 3 tiles before moving forward.

If you do need to go back, Shaizuko offers this tip: "...when the cinematic ends if you go forward to the door and look up to the right, there is a way to climb back up on the cliff back to the balcony, I just tested it, so even if you miss one, you can still go back after."

In the second half (after reaching the balcony), the vault will be to your right, but there are still 2 tiles to collect before going there and they're pretty easy to find on the second floor of the building in front of you, and on the ground floor in the building off to your left from where the game starts you off.

Once you have all 5 pieces, make your way to the vault room where you'll need to place the tiles in the spots the game highlights and read each clue. There are 5 pedestals in the room with a rotating wheel with 4 pictures that are the corresponding answers to the clues. Using Amber Vision you can see the order they go in by the Roman numerals in the white circular mat by each pedestal. This is a very easy puzzle, trust me.

Once all of the pictures on the pedestals are in place the staircase down to the vault is open. Once down in the vault you'll see that there are dozens of vials of Amber lining the room. You can stay here and drink them to your heart's content, using Invisibility to grind out the time.

When you are in a safe place Save the game manually. Then simply turn invisible and wait. When you run out of amber reload the save and repeat. Your tracker will continue to go up. It goes up between 5-7 % each time.