Here is the full list of all 15 Hunter's Trophy 2 Australia achievements worth 400 gamerscore.
Unlock all of the hunter's skills
Complete all of the hunt plans for the Hunting Season
Get the sniper permit
Get the pro permit
Kill an animal that is not in the hunt plan
Kill a kangaroo
Kill a fleeing big game animal
While stalking, do not get spotted by a big game animal
Participate in all shooting range tests
Get the big game permit
Kill 100 pests
Get the dog-handler permit
Having killed a dog
Kill 10 pests
Get the hunting permit