Took me many many games but I got my first heroic deed! Unfortunately it's for the worst map and has the worst affixes :P
Difficulty: Veteran
Map: Halescourge
Affixes: Sudden death (you go down, you die instantly)
Can't remember what the other one was called but basically there are no pickups on the map. None. No ammo, no health, no bombs.
Tried it with a couple of mates once and it didn't end well x)