I mean stuff you dont do in any other level
"Escort Nechayev"
"Destroy the Reactor"
"Deliver the Bioweapon"
"Hack the Missile"
"Destroy the Gate"
But seriously, if there was a unique mission for one map, that mission would be odd, since it's only done once. Each map would need thier own unique mission, and I'm fine with each map having their own layout of missions and routes.