There are 23 grazer training dummies in the game that you need to destroy in order to unlock the “Downed 23 Grazer Dummies Trophy”. These are not marked in your map and there’s no collectible map that you can buy for them so you have to manually look for them. These can be destroyed in any order you want. They can be destroyed before even reaching the Carja border.
You can track down how many training dummies you found by going to Notebook > Statistics > Other > Training Dummies. Refer to the videos below for more details.
All of these are found within the yard of Rost’s home.
Fast-travel to the campfire outside the lodge where Aloy stayed the night before The Proving. Once is immediately visible beside the lodge, while the other is located a bit behind it.
The two dummies are located on opposite sides, outside the wall of Mother’s Watch
There’s one dummy in the settlement area, to the southwest corner while the other one is located outside Karst’s shop, southeast of the Cradle.
The two dummies are found along the uphill path, outside of the Nora Hunting Grounds.
After taking the uphill path to reach the settlement, turn to the left of the small house to find the first dummy. The second dummy is on the other side, beside the cooking spit.
Found near the northern gate of the settlement.
Found near the southeast exit/gate of the camp.
Found within the camp’s vicinity, by the rocks to the north.
This one’s fairly not noticeable. It’s located upstairs north of the campfire, by the storage shed.