PSA: bloodthirsty medals do not count if carried between rounds of domination/demolition ect. I got a bloodthirsty with the crossbow 4-0 on round one and then got a kill in round 2. It gave me the medal but did not give me the camo. 

I did this is demo so maybe it's different for domination but it's presumably the same.

Bloodthirsty medals for camos must be done in one round.

I don't play search but the same concept probably applies.