Blacksad: Under the Skin

After you beat someone up for once, you'll be in the building. Look around, try and fail to do anything with the vats, and look at the Native American paraphernalia on the loft above the office. You have the ability to call Weekly or Smirnov; I didn't try it so don't know if that gives you anything, but you don't need to.

Then go back and talk to the horse in the trailer. He will be very uncooperative. Use your senses and look at his necklace, then make a deduction:

Then you can talk to him about how mothers are always supportive. I'm not sure how much the actual conversation path matters; I said I failed everything, I didn't go to class, I was a ruthless soldier. The game noted that I got Gil to talk with empathy - this may mean you can threaten him into submission without talking about his mother, or some other way.

Then interact with Vat #3 and go downstairs. Go through the door in the back of the room and interact with the girl (the first thing to remember is to tell her "I don't want to scare you", mentioned here because that choice is timed) to get

Afterward, go back out and go through the other door. Look at pills, stacks of movies, a notebook with a list of names, the projector, and the projector screen. You can watch movies about Brunhilda and about Spannow. Then you have to make a couple deductions:

Then a rat will come in and I don't believe it matters what you say to him. He'll dump some exposition on you. When you use your senses to look at his eyes, you'll get clocked upside the head and this achievement.