This is not mine. I took this from a post located at ( [ Register or Signin to view external links. ] )

The following is a complete and official list of the secret or hidden challenges as found on the callofduty elite website:



1) challenge.mw3.ch_infected.name = Get knifed by an enemy who is wearing the Infected title (lvl 4)


2) challenge.mw3.ch_plauge.name = Knife an enemy who is wearing the Transfer title (lvl 4)



3) challenge.mw3.ch_no.name = Kill an enemy while he is cooking a frag grenade (lvl 4)



4) challenge.mw3.ch_ renaissance.name = Kill 3 different enemies with 3 different guns in 1 life (lvl 4)


5) challenge.mw3.ch_ sidekick.name = Get 3 kills in 1 life with your secondary weapon (lvl 4)



6) challenge.mw3.ch_avenger.name = Avenge a teammates death (lvl 4)



7) challenge.mw3.ch_theloner.name = Get a 10 killstreak with no killstreaks selected (lvl 4)



8) challenge.mw3.ch_radiationsickness.name = get killed by an enemy M.O.A.B. (lvl 4)



9) challenge.mw3.ch_nuke.name = Call in 250 (8 tiers) M.O.A.B.s (lvl 4)



10) challenge.mw3.ch_hijacker.name = Highjack 200 (3 tiers) enemy crates (lvl 4)



11) challenge.mw3.ch_livingdead.name = Survive Final Stand (lvl 32)



12) challenge.mw3.ch_martyr.name = Get a kill from your Martyrdom deathstreak grenade (lvl 51)


13) challenge.mw3.ch_clickclickboom.name = Get a kill with C4 while in Final Stand (lvl 69)



14) challenge.mw3.ch_6fears7.name = UNKNOWN (lvl ?)



I discovered these by logging into the elite wedsite and checking my stats under: MW3 PLAYER CARD. I scrolled down to the CHALLENGES section and checked the NEAREST COMPLETION list. Everytime I ranked up a couple of levels, I would check that list again. Whenever I spotted one of these challenges there, I put a tracker on it. Now my TRACKED CHALLENGES list has all 14 secret challenges permanently marked. I assume that there are no more secret/hidden challenges like this left in the game, and that 14 is the complete number. The only way to spot and track these challenges is to periodically check your NEAREST COMPLETION list and hope another one pops up in there that you haven't already put a marker on. Also, every single one of these challenges will reset when you prestige. So if you are at 199 hijacked crates and then you prestige, you will have to start all over again. The only reason you would actually want to do that one, for example, would be to get the treasure chest emblem.



The lvl # in brackets refers to the minimum required level ranking in any given prestige (including prestige zero) in order to be able to complete (or start working on) the challenge. Challenges 11-13 can be completed at lvl 4 as well, but that would mean spending 3 prestige tokens on the Final Stand deathstreak, the Martyrdom deathstreak, and the C4. But who would be dumb enough to do that, haha! (well, maybe the C4...)



There is only 1 thing that I have not yet been able to personally confirm: I do not know how to get the 6fears7 challenge. Since there is no 7-8-9 killstreak combo in any of the 3 strike packages, it cannot be unlocked the same way as it was in MW2. I have tried a 7-9-10 combo, and a 6-7-blank combo but I didn't unlock anything. If anyone figures out how to unlock this one, please post the solution. Also, I do not know the lowest possible rank level that this can be achieved at (or start being worked on) since I obviously do not know how to do it, haha!