Kill 2 or more enemies with a single AT4 or RPG, 50 times
get 2500 headshots
call in 25
10000 headshots with snipers
To unlock the all pro emblem you must acheive this ... get 2 headshots with 1 bullet.
There is no rhino emblem. Unless you are talking about the Ghost emblem, in that case it would be reaching 10th Prestige.
The hyena...You have to get 50 kills with a RPG.
Get a game winning killcam with a Riot Shield.
Shoot a claymore and kill them this is hard
Achieve the ACR Mastery Challenge.
in order to obtain the dog emblem you must kill two or more people with a single frag 50 times
To unlock the Intervention emblem, you must get 1,000 kills with the Intervention after Prestiging at least once.
The pirate flag emblem is currently unknown and not verified... but the skull and bones emblem is when you get twenty game winning kills.