are any of the DLC worth it

[PhantomSoldier]

dothey add anything to single player or an acheivements?

[kn00tcn]

the achievement list mentions the map pack, which you can play in arcade or multiplayer

[Joan Lee Benway]

only doggie bag adds any achievements
for the rest i would not recommend for anyone but the weapon pack got a very nifty purple kalashnikov
and the mask pack we’re just useless tbh