To get this achievement you have to tell the hunter group "The wild shotgun" the location of the trihorn deer.
You need both the nightvision and the recording add on.
Step-by-step guide.
1. Click on the coordinate numbers in the bottom right and search them in the browser.
2. With the coordinates you can learn the location and searching the nameof the location gives you the hunter keyword.
3. Wait until 22:00-0:00, reveal the trihorn deers with your nightvision and record them while your at it.
4. Search for hunter + trihorn to get the name of the wild shotgun.
5. Search for the wild shotgun to get their contactinfos.
6. Chat with them, tell them the location of the trihorn deers and show them the recorded video of the deer.
7. The following night you can spot the deer getting shot (which you can record and send to shock.tv). The next day you will get a message from the wild shotgun and soon after a package with the collectable. This should also give you the achievement.