Obtain and use every Power-Up type in any Shooting Gallery level.
This one will eventually unlock when playing through all the galleries. The power-ups include: 2x Score, Slow-mo, Hunter Sense. and Rapid Shot. Really easy can be done on one run of any shooting gallery.
Kill 7 Birds with one Shotgun shot.
Easily done on Shooting Galleries on Classic #8 towards end of level their are just flocks of them. Just time your shot or use Slow-mo to make this one easier.
A better explanation from Kevin Olofson in this video below.
Disarm 30 traps in Story Mode (bear traps or land mines).
Location Chapter 2 - Full Moon or Chapter 9 - Outpost. Just make sure you shoot every bear trap or mine you see. Can be seen easier with Hunter Sense.