Go outside in the front at the truck, you will see an owl. Look down there is a small sculpture, take it and launch it on the owl to get the first trophee. You can use you two hand to increase the size of the sculpture before throwing it, and you can also duplicate it if you have trouble aiming at the owl.

Then you need to look at all the yeti. For the first, go to the owl and look at the right you will see sea lion, go here and look in the island (with igloo), you will see the first yeti. Then go back at the owl and go left near the telescope, there is a yeti around the rock. Then go behind the truck, near the fallen tree, there is a yeti behind a tree behind the fallen tree.

Then go back inside the truck, take the audio tape and put it in the player. Search for an other tape near the front of the truck (still insead) and put it in the player. Go near the tv take the tape and put it in the tv to see the last yeti inside the tv. Near the panel there is a magnifying glass with a yeti drawing below. Look below the desk to see the last audio tape and put it in the player.

You will now have all the three trophee (and you should now understand the story behind the map).

Please note that maybe not all this action are required, I just listed everything I done. I also played with the truck control put this is probably unecessary.