Kill 3 enemies while you are the only surviving member of your team
To get the title 'toxic'in mw3 you must be killed by an enemy MOAB. A MOAB is a giant bomb you get in mw3 for getting a 25 kill streak. Or 24 if you are using the perk Hardline
Kill the same enemy 5 times in a single match
Hurt an enemy with a primary weapon, then finish them off with a pistol
Get 5 health regeneration from enemy damage in a row, without dying
Kill an enemy before they earn a 10 or higher killstreak reward
The red scope title in MW3 is not the current title used on the game. Currently there is not a way to get that type of title but it may be unlocked in the future.
A title called 'flyswatter'
You Hack
Avenge a fallen teamate
the ~AussiePride~ title you get it buy joining the clan Aus~ on elite
35 gamescore (xbox) but thats about it...
You can't,and if your thinking about the [Enemy Intel] those are for achievements.